Webhooks exceptions

500.30 ASP.NET Core app failed to start - System.TypeInitializationException: The type initializer for 'System.Threading.Tasks.Task' threw an exception

Exception

Exception Info: System.TypeInitializationException: The type initializer for 'System.Threading.Tasks.Task' threw an exception.
 ---> System.IO.FileNotFoundException: Could not load file or assembly 'System.Threading.Tasks, Version=4.0.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.
File name: 'System.Threading.Tasks, Version=4.0.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
   at Dynatrace.OneAgent.Introspection.TaskEventHandler.NotifyCreated(Object taskObject, Object stateObject)
   at System.Threading.Tasks.Task..ctor(Boolean canceled, TaskCreationOptions creationOptions, CancellationToken ct)
   at System.Threading.Tasks.Task..cctor()
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.get_CompletedTask()
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean useAsync)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
   at System.Diagnostics.StackTraceSymbols.TryOpenFile(String path)
   at UiPath.IdentityServer.Web.Program.<Main>(String[] args)

Cause

The issue is caused by the Dynatrace agent responsible for Application Performance Monitoring (APM).

Solution

Upgrade to the latest standalone version or to the minimum version in support. See the Product lifecycle page for details.

OR

Disable AppInsights, Dynatrace, NewRelic, DataDog.

500.30 ASP.NET Core app failed to start - Managed server didn't initialize after X ms

Exception

Application '/LM/W3SVC/1/ROOT' with physical root 'C:\Program Files (x86)\UiPath\APPLICATIONNAME\' failed to load coreclr. Exception message:
Managed server didn't initialize after X ms.

Cause

The startup time limit might be restrictive and cause downtime in environments affected by high CPU usage and memory consumption.

Solution

Upgrade to 20.10.5+ to increase the startup time limit to 300 seconds.

If this is insufficient, it means that the server is attempting to execute something, and has a deadlock. This is usually the case when the EnableMigrations parameter is set to True, and there is a large migration hanging the main thread.

If the flag is set to False, collect a memory dump, and submit it to your customer representative.