Sometimes, immediately after the server is loaded, such an error appears. It repeats many times, after which the console freezes. At the same time, the server continues to work, but the plug-ins cannot be changed.
What is the reason?

Exception thrown when sending notification: System.Threading.Tasks.TaskCanceledException: A task was canceled.
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00026] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in <fb001e01371b4adca20013e0ac763896>:0
at System.Net.Http.HttpClientHandler+<SendAsync>d__64.MoveNext () [0x004f5] in <7ebf3529ba0e4558a5fa1bc982aa8605>:0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0001a] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in <fb001e01371b4adca20013e0ac763896>:0
at System.Net.Http.HttpClient+<SendAsyncWorker>d__47.MoveNext () [0x000ca] in <7ebf3529ba0e4558a5fa1bc982aa8605>:0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0001a] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in <fb001e01371b4adca20013e0ac763896>:0
at CompanionServer.NotificationList+<SendNotificationImpl>d__13.MoveNext () [0x00169] in <a1a76f898f8c418f92ad32de2c24276b>:0
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 35)

What is it????????????????????????????????????????????????????????

Exception thrown when sending notification: System.Threading.Tasks.TaskCanceledException: A task was canceled.
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00026] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in <fb001e01371b4adca20013e0ac763896>:0
at System.Net.Http.HttpClientHandler+<SendAsync>d__64.MoveNext () [0x004f5] in <7ebf3529ba0e4558a5fa1bc982aa8605>:0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0001a] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in <fb001e01371b4adca20013e0ac763896>:0
at System.Net.Http.HttpClient+<SendAsyncWorker>d__47.MoveNext () [0x000ca] in <7ebf3529ba0e4558a5fa1bc982aa8605>:0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0001a] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <fb001e01371b4adca20013e0ac763896>:0
at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in <fb001e01371b4adca20013e0ac763896>:0
at CompanionServer.NotificationList+<SendNotificationImpl>d__13.MoveNext () [0x00169] in <a1a76f898f8c418f92ad32de2c24276b>:0
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 35)