Administration Hub Diagram Error LFAH500

asked on April 7

I've just updated the Administration Hub to the latest version and am excited to check out the new Diagram feature. However, I only see this error message:

Laserfiche Administration Hub encountered an internal error. Please try again. [LFAH500-InternalError]

I checked the logs in C:\ProgramData\Laserfiche\AdminHub\Logs\AdminHubLog_w3wp.log and found the following:

2025-04-07 14:52:27.1532||ERROR|AdminHubLogs|26|--- 2025-04-07T21:52:27.1219973Z AHWebContext started.
[+22ms][ERROR][Thread-26] Value cannot be null.
Parameter name: key
Stack Trace:
Caught exception: System.ArgumentNullException
Message: Value cannot be null.
Parameter name: key
   at System.Runtime.Caching.MemoryCache.GetInternal(String key, String regionName)
   at System.Runtime.Caching.MemoryCache.Contains(String key, String regionName)
   at Laserfiche.AdminHub.Utils.DNSUtil.GetFQDN(String machineName)
   at Laserfiche.AdminHub.Web.WebAPI.ApplicationInfoController.<Get>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Threading.Tasks.TaskHelpersExtensions.<CastToObject>d__1`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__6.MoveNext()
[+23ms][ERROR][Thread-26] AHWebContext operation successful.

Any ideas on how I can fix this?

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SELECTED ANSWER

replied on April 7

After waiting a while, this seemed to resolve itself. It looks like it just takes time for the hub service to gather the necessary information from LFDS.

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replied on April 8

Hi Kevin,

Thanks for reporting the issue. The attached log really helps. We created a bug for it (internal id 585572).

Did you configured/upgraded some other Laserfiche applications between the 2 Diagram page visits, we think the issue has something to do with unconfigured applications.

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replied on April 8

Shengyao,

Yes, I do have a couple unconfigured applications, but I did not configure them between the times this was not working and when it began working. I did, however, upgrade them to the newest version using the Laserfiche Installer during that time.

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Administration Hub Diagram Error LFAH500

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