Roon Core Machine
i7 sonicTransporter
version 1.8 build 831
remote on iPad 14.8
Networking Gear & Setup Details
Actiontec T2200h modem/router
EtherRegen switch
Connected Audio Devices
router =>(ethernet cable) sonicTransporter
sonicTransporter =>( ethernet cable) etherRegen
etherRegen => (ethernet cable) UltraRendu
UltraRendu=>(USB) Auralic vega
Number of Tracks in Library
5000 tracks
Description of Issue
I updated version 1.8 and played successfully for an hour. I came back two days later and can’t connect to server. On opening remote it tells me to choose a core (given with correct ip address) and login. Then tells me I’m already logged and no connection occurs. Nothing has changed in my network and the server is still online. I reinstalled Roon remote and it didn’t help ( I accidentally installed Roon essentials first and it said it detected roon core on my system). I re-installed core and it didn’t help. Server log attached, please help.
09/26 17:12:06 Info: Starting RoonServer v1.8 (build 831) stable on linuxx64
09/26 17:12:06 Trace: Checking if we are already running
09/26 17:12:06 Warn: get lock file path: /tmp/.rnsems0-roon
09/26 17:12:06 Trace: Nope, we are the only one running
09/26 17:12:06 Info: Is 64 bit? True
09/26 17:12:06 Info: Command Line Argument: -watchdogport=43433
09/26 17:12:06 Trace: [childprocess] using .NET child process
09/26 17:12:06 Trace: [realtime] fetching time from NTP server
09/26 17:12:06 Trace: [orbit] init seq=0, pending=0, spcount=7, uidcount=2
09/26 17:12:06 Info: [broker] starting e43de8d3-ff1b-4c9b-98e6-d67633bdba7d
09/26 17:12:06 Warn: [realtime] failed to get time: Could not resolve host 'pool.ntp.org'
09/26 17:12:06 Trace: [httpcache] loaded 0 cache entries from /var/roon/RoonServer/Cache/httpcache_2.db, current: 0mb / 128mb
09/26 17:12:06 Info: [broker/locations] adding storage location: Internet:Name=Internet Media:Id=e268f098-04c4-4e65-af3f-38ba3c3fcecb
09/26 17:12:06 Info: [broker/locations] media availability: Internet:Name=Internet Media:Id=e268f098-04c4-4e65-af3f-38ba3c3fcecb is online
09/26 17:12:06 Info: [broker/locations] adding storage location: MetadataService:Name=Metadata Service:Id=13769258-b70b-4243-b1d6-bd46e8257ba8
09/26 17:12:06 Info: [broker/locations] media availability: MetadataService:Name=Metadata Service:Id=13769258-b70b-4243-b1d6-bd46e8257ba8 is online
09/26 17:12:06 Info: [broker/locations] adding storage location: Offline:Name=Offline:Id=f1e4b43f-f643-47ba-b875-fd93b32a6006
09/26 17:12:06 Debug: [broker/locations/migration] start, propname: location_automounts
09/26 17:12:06 Debug: [broker/locations] load pre 1.3 automounts, strlist:
09/26 17:12:06 Info: [broker/locations] adding storage location: DefaultMusicFolder:Name=Music Folder:Id=29bdcae6-b5fd-d666-27bf-a1f6afceabac
09/26 17:12:06 Debug: [broker/locations] write pre 1.3 automounts, strlist:
09/26 17:12:06 Info: [media] resolved oop decoder to /usr/bin/ffmpeg
09/26 17:12:06 Trace: [brokerserver] Enabling broker server
09/26 17:12:06 Info: [broker/distributed] HTTP server listening on port 9100
09/26 17:12:06 Trace: [brokerserver] Enabling https broker server
09/26 17:12:06 Info: [broker/distributed] HTTPS server listening on port 9315
09/26 17:12:06 Trace: [broker/backups] initializing
09/26 17:12:06 Trace: [broker/accounts] Data updated. AccountStatus=NoAccountConfigured MachineStatus=NeedsAccount UserId=
09/26 17:12:06 Trace: [broker/accounts] [heartbeat] now=9/26/2021 9:12:06 PM nextauthrefresh=9/26/2021 9:07:06 PM nextmachineallocate=9/26/2021 9:12:06 PM
09/26 17:12:06 Trace: [broker/accounts] doing auth refresh, next=9/26/2021 9:07:06 PM
09/26 17:12:06 Trace: [broker/accounts] doing machine allocate, next=9/27/2021 1:12:06 AM
09/26 17:12:06 Trace: [inetdiscovery] added device broker/e43de8d3-ff1b-4c9b-98e6-d67633bdba7d in addr:__ADDR__
09/26 17:12:06 Info: [libraryapi] loaded first run time 9/24/2021 11:29:35 PM
09/26 17:12:06 Trace: [devicedb] initializing
09/26 17:12:07 Info: [raatserver] [runner] Start or Connect...
09/26 17:12:07 Info: [raatserver] [runner] Start or Connect... /opt/RoonServer/Appliance/RAATServer
09/26 17:12:07 Info: ConnectOrStartAndWaitForExit RAATServer, path: /opt/RoonServer/Appliance/RAATServer
09/26 17:12:07 Trace: [broker/services] refreshing metadata URL bits
09/26 17:12:07 Info: [broker/services] using URL override for identifier: https://identifier.roonlabs.net/identifier/
09/26 17:12:07 Info: [broker/services] using URL override for imagecache: https://imagecache.roonlabs.net/im/
09/26 17:12:07 Info: [broker/services] using URL override for swim: https://swim.roonlabs.net/
09/26 17:12:07 Info: [broker/services] using URL override for qobuzservice: https://qobuz.roonlabs.net/
09/26 17:12:07 Info: [broker/services] using URL override for tidalservice: https://tidal.roonlabs.net/
09/26 17:12:07 Info: connected to watchdogport: 43433
09/26 17:12:07 Debug: [broker/filebrowser/nassharemaker] rebuildsymlinks
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys
09/26 17:12:07 Info: [raatserver] [runner] Status: Started
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys because it is not a /dev/sd[0-9]* (mountline: sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0)
09/26 17:12:07 Info: [broker/messaging] initializing
09/26 17:12:07 Info: [metadata] initializing
09/26 17:12:07 Info: [music] first pass through media thread is done
09/26 17:12:07 Info: [transport] initializing
09/26 17:12:07 Trace: [devicedb] refreshing, etag=W/"206090-17c0d2c8627"
09/26 17:12:07 Trace: [ipaddresses] enumerating addresses
09/26 17:12:07 Trace: [ipaddresses] SKIPPED lo: not up
09/26 17:12:07 Trace: [ipaddresses] SKIPPED eth0: no ipv4
09/26 17:12:07 Trace: [ipaddresses] SKIPPED eth1: no ipv4
09/26 17:12:07 Trace: [ipaddresses] SKIPPED eth2: no ipv4
09/26 17:12:07 Trace: [ipaddresses] SKIPPED eth3: no ipv4
09/26 17:12:07 Trace: [ipaddresses] SKIPPED br0: no ipv4
09/26 17:12:07 Trace: [broker/accounts] doing auth refresh in EnsureAuthReady, next=9/26/2021 10:12:07 PM
09/26 17:12:07 Warn: [auth] EnsureAuthReady failed: Result[Status=NotLoggedIn]
09/26 17:12:07 Trace: [devicedb] builtin device db found at /opt/RoonServer/Appliance/devicedb-prod.zip
09/26 17:12:07 Trace: [devicedb] cached device db found at /var/roon/RoonServer/Cache/devicedb-prod.zip
09/26 17:12:07 Info: [broker/dropbox] no account configured
09/26 17:12:07 Trace: [devicedb] loading device db at /var/roon/RoonServer/Cache/devicedb-prod.zip
09/26 17:12:07 Info: [remoting] loaded protocol hash e489d012e57c96f99d2795d6ba715e7a76198f2e from /opt/RoonServer/Appliance/Roon.Broker.Api.Remote.dll
09/26 17:12:07 Info: [broker/distributed] Remoting server listening on port 9101
09/26 17:12:07 Trace: [inetdiscovery] added service com.roonlabs.roon.broker.tcp for device broker/e43de8d3-ff1b-4c9b-98e6-d67633bdba7d
09/26 17:12:07 Trace: [inetdiscovery] added service com.roonlabs.roon.broker.http for device broker/e43de8d3-ff1b-4c9b-98e6-d67633bdba7d
09/26 17:12:07 Trace: [geoip] GET https://geoip.roonlabs.net/geoip/1/lookup
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /proc 09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /proc
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /proc because it is not a /dev/sd[0-9]* (mountline: proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0)
09/26 17:12:07 Info: [loadstatus] IsLibraryLoading True => False
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /dev
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /dev because it is not a /dev/sd[0-9]* (mountline: devtmpfs /dev devtmpfs rw,nosuid,size=4010168k,nr_inodes=1002542,mode=755 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/kernel/security
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/kernel/security because it is not a /dev/sd[0-9]* (mountline: securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /dev/shm
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /dev/shm because it is not a /dev/sd[0-9]* (mountline: tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /dev/pts
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /dev/pts because it is not a /dev/sd[0-9]* (mountline: devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /run
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /run because it is not a /dev/sd[0-9]* (mountline: tmpfs /run tmpfs rw,nosuid,nodev,mode=755 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup because it is not a /dev/sd[0-9]* (mountline: tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/unified
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup/unified because it is not a /dev/sd[0-9]* (mountline: cgroup2 /sys/fs/cgroup/unified cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/systemd
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup/systemd because it is not a /dev/sd[0-9]* (mountline: cgroup /sys/fs/cgroup/systemd cgroup rw,nosuid,nodev,noexec,relatime,xattr,name=systemd 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/pstore
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/pstore because it is not a /dev/sd[0-9]* (mountline: pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/bpf
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/bpf because it is not a /dev/sd[0-9]* (mountline: none /sys/fs/bpf bpf rw,nosuid,nodev,noexec,relatime,mode=700 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/cpu,cpuacct
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup/cpu,cpuacct because it is not a /dev/sd[0-9]* (mountline: cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/net_cls,net_prio
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup/net_cls,net_prio because it is not a /dev/sd[0-9]* (mountline: cgroup /sys/fs/cgroup/net_cls,net_prio cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/perf_event
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup/perf_event because it is not a /dev/sd[0-9]* (mountline: cgroup /sys/fs/cgroup/perf_event cgroup rw,nosuid,nodev,noexec,relatime,perf_event 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/blkio
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup/blkio because it is not a /dev/sd[0-9]* (mountline: cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/freezer09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/freezer
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup/freezer because it is not a /dev/sd[0-9]* (mountline: cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/pids
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup/pids because it is not a /dev/sd[0-9]* (mountline: cgroup /sys/fs/cgroup/pids cgroup rw,nosuid,nodev,noexec,relatime,pids 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/cpuset
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup/cpuset because it is not a /dev/sd[0-9]* (mountline: cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/hugetlb
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup/hugetlb because it is not a /dev/sd[0-9]* (mountline: cgroup /sys/fs/cgroup/hugetlb cgroup rw,nosuid,nodev,noexec,relatime,hugetlb 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/devices
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup/devices because it is not a /dev/sd[0-9]* (mountline: cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/fs/cgroup/memory
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/fs/cgroup/memory because it is not a /dev/sd[0-9]* (mountline: cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/kernel/config
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/kernel/config because it is not a /dev/sd[0-9]* (mountline: configfs /sys/kernel/config configfs rw,relatime 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /dev/hugepages
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /dev/hugepages because it is not a /dev/sd[0-9]* (mountline: hugetlbfs /dev/hugepages hugetlbfs rw,relatime,pagesize=2M 0 0)
09/26 17:12:07 Warn: Error in web request https://geoip.roonlabs.net/geoip/1/lookup: NetworkError (Error: NameResolutionFailure)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /sys/kernel/debug
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /sys/kernel/debug because it is not a /dev/sd[0-9]* (mountline: debugfs /sys/kernel/debug debugfs rw,relatime 0 0)
09/26 17:12:07 Warn: [easyhttp] [2] Get https://messaging.roonlabs.net/1/api/messages/ web exception without response: Error: NameResolutionFailure
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /dev/mqueue
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /dev/mqueue because it is not a /dev/sd[0-9]* (mountline: mqueue /dev/mqueue mqueue rw,relatime 0 0)
09/26 17:12:07 Critical: scx: System.ArgumentNullException: Value cannot be null.
Parameter name: source
at System.Linq.Enumerable.Select[TSource,TResult] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] selector) [0x0000d] in <7f6b4a389aed488594a54f15a4927c5a>:0
at Sooloos.Broker.Messaging.Module._maybe_update_from_cache (Base.JDictionary cache_jdic) [0x00073] in <62b21a183a274b248e6366808e4a08e7>:0
at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.b__7_0 (System.Object state) [0x00000] in :0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.b__7_0 (System.Object state) [0x00000] in :0
at Sooloos.SynchronizationContextThread._Dispatch (Sooloos.SynchronizationContextThread+SendOrPostWrapper& ret) [0x00012] in <11073c9a2e2d4614af4b2a7f4d419d45>:0
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /proc/sys/fs/binfmt_misc
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /proc/sys/fs/binfmt_misc because it is not a /dev/sd[0-9]* (mountline: systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=50,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=19935 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /tmp
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /tmp because it is not a /dev/sd[0-9]* (mountline: tmpfs /tmp tmpfs rw,nosuid,nodev 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /boot
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /var/lib/nfs/rpc_pipefs
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /var/lib/nfs/rpc_pipefs because it is not a /dev/sd[0-9]* (mountline: sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0)
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] initial listing found drive mounted at /storage
09/26 17:12:07 Debug: [broker/filebrowser/volumeattached] skipping /storage because it is not a /dev/sd[0-9]* (mountline: /dev/mapper/VolGroup-lv_storage /storage ext4 rw,relatime 0 0)
09/26 17:12:07 Info: [stats] 2046mb Virtual, 102mb Physical, 21mb Managed, 0 Handles, 28 Threads
09/26 17:12:07 Trace: [devicedb] loaded 129 vendors, 750 products from devicedb with timestamp 9/22/2021 11:03:13 AM
09/26 17:12:07 Info: [loadstatus] IsTransportLoading True => False
09/26 17:12:07 Info: [loadstatus] IsStartup True => False
09/26 17:12:07 Info: [roonapi] initializing
09/26 17:12:07 Warn: [easyhttp] [1] Get https://devicedb.roonlabs.net/1/devicedb-prod.zip web exception without response: Error: NameResolutionFailure
09/26 17:12:07 Trace: [inetdiscovery] added service com.roonlabs.roon.api.tcp for device broker/e43de8d3-ff1b-4c9b-98e6-d67633bdba7d
09/26 17:12:07 Trace: [inetdiscovery] added service com.roonlabs.roon.api.http for device broker/e43de8d3-ff1b-4c9b-98e6-d67633bdba7d
09/26 17:12:07 Info: [roonapi] listening on port 9150
09/26 17:12:07 Warn: [devicedb] While refreshing, status: 999, body: System.Net.WebException: Error: NameResolutionFailure
at System.Net.WebConnection.Connect (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x00044] in <9f7747ca7df742bc9cc8f94c1fafe024>:0
at System.Net.WebConnection.InitConnection (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x000cc] in <9f7747ca7df742bc9cc8f94c1fafe024>:0
at System.Net.WebOperation.Run () [0x0009a] in <9f7747ca7df742bc9cc8f94c1fafe024>:0
at System.Net.WebCompletionSource`1[T].WaitForCompletion () [0x00094] in <9f7747ca7df742bc9cc8f94c1fafe024>:0
at System.Net.HttpWebRequest.RunWithTimeoutWorker[T] (System.Threading.Tasks.Task`1[TResult] workerTask, System.Int32 timeout, System.Action abort, System.Func`1[TResult] aborted, System.Threading.CancellationTokenSource cts) [0x000f8] in <9f7747ca7df742bc9cc8f94c1fafe024>:0
at System.Net.HttpWebRequest.EndGetResponse (System.IAsyncResult asyncResult) [0x00020] in <9f7747ca7df742bc9cc8f94c1fafe024>:0
at System.Threading.Tasks.TaskFactory`1[TResult].FromAsyncCoreLogic (System.IAsyncResult iar, System.Func`2[T,TResult] endFunction, System.Action`1[T] endAction, System.Threading.Tasks.Task`1[TResult] promise, System.Boolean requiresSynchronization) [0x0000f] in :0
--- End of stack trace from previous location where exception was thrown ---