I have seen this in other systems before, and I am now seeing it in my own system. When trying to access Forms I am taken to an error page. When looking in the Event Viewer in the Admin log for Forms I am seeing the following 2 errors:

Log Name:      Laserfiche-Forms-App/Admin
Source:        Laserfiche-Forms-App
Date:          10/8/2025 7:00:52 AM
Event ID:      10502
Task Category: UnexpectedErrorErrorAdmin
Level:         Error
Keywords:      Session0,Session1,Session2,Session3
User:          XXXX
Computer:      XXXX
Description:
An unexpected error has occurred. [LFF502-UnexpectedError]

Details:
URL: 
Error: UnexpectedError
Date: 10/8/2025 7:00:52 AM (US Mountain Standard Time)
HTTP Status Code: 500
Business Process ID: 0
User: XXXX
IP: XXXX
Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36 Edg/141.0.0.0
Business Process Name: 

Stack Trace:
Caught exception: Laserfiche.Forms.CommonUtils.Exceptions.LFFormsException
Message: An unexpected error has occurred. [LFF502-UnexpectedError]


Inner exception: System.NullReferenceException
Message: Object reference not set to an instance of an object.
   at E_Forms.MvcApplication.WSFederationAuthenticationModule_SignedIn(Object sender, EventArgs e)


Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Laserfiche-Forms-App" Guid="{98141CA4-660B-51C6-66B4-EC37F5B2FD87}" />
    <EventID>10502</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>55032</Task>
    <Opcode>0</Opcode>
    <Keywords>0x4000f00000000000</Keywords>
    <TimeCreated SystemTime="2025-10-08T14:00:52.326090300Z" />
    <EventRecordID>46588</EventRecordID>
    <Correlation />
    <Execution ProcessID="4592" ThreadID="5336" />
    <Channel>Laserfiche-Forms-App/Admin</Channel>
    <Computer>XXXX</Computer>
    <Security UserID="XXXX" />
  </System>
  <EventData>
    <Data Name="message">An unexpected error has occurred. [LFF502-UnexpectedError]

Details:
URL: 
Error: UnexpectedError
Date: 10/8/2025 7:00:52 AM (US Mountain Standard Time)
HTTP Status Code: 500
Business Process ID: 0
User: XXXX
IP: 10.96.8.10
Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36 Edg/141.0.0.0
Business Process Name: 

Stack Trace:
Caught exception: Laserfiche.Forms.CommonUtils.Exceptions.LFFormsException
Message: An unexpected error has occurred. [LFF502-UnexpectedError]


Inner exception: System.NullReferenceException
Message: Object reference not set to an instance of an object.
   at E_Forms.MvcApplication.WSFederationAuthenticationModule_SignedIn(Object sender, EventArgs e)

</Data>
  </EventData>
</Event>

AND...
 

Log Name:      Laserfiche-Forms-App/Admin
Source:        Laserfiche-Forms-App
Date:          10/8/2025 7:00:52 AM
Event ID:      19904
Task Category: AuditTrailUnableToRecordEventErrorAdmin
Level:         Error
Keywords:      Session0,Session1,Session2,Session3
User:          XXXX
Computer:      XXXX
Description:
The audit event could not be recorded. [LFF9904-AuditTrailUnableToRecordEvent]

Details:
URL: 
Error: AuditTrailUnableToRecordEvent
Date: 10/8/2025 7:00:52 AM (US Mountain Standard Time)
HTTP Status Code: 500
Business Process ID: 0
User: XXXX
IP: XXXX
Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36 Edg/141.0.0.0

Stack Trace:
Caught exception: Laserfiche.Forms.CommonUtils.Exceptions.LFFormsException
Message: The audit event could not be recorded. [LFF9904-AuditTrailUnableToRecordEvent]


Inner exception: System.NullReferenceException
Message: Object reference not set to an instance of an object.
   at Forms.Auditing.Model.AuditEventType.IsEventRecordEnabled(FormsAuditEvent auditEvent, AuditEventSettings eventTypeSettings)
   at Forms.Auditing.Service.FormsAuditingService.RecordFailure[T](T auditEvent, FormsErrorCode errorCode)


Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Laserfiche-Forms-App" Guid="{98141CA4-660B-51C6-66B4-EC37F5B2FD87}" />
    <EventID>19904</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>45630</Task>
    <Opcode>0</Opcode>
    <Keywords>0x4000f00000000000</Keywords>
    <TimeCreated SystemTime="2025-10-08T14:00:52.327218500Z" />
    <EventRecordID>46589</EventRecordID>
    <Correlation />
    <Execution ProcessID="4592" ThreadID="5336" />
    <Channel>Laserfiche-Forms-App/Admin</Channel>
    <Computer>XXXX</Computer>
    <Security UserID="XXXX" />
  </System>
  <EventData>
    <Data Name="message">The audit event could not be recorded. [LFF9904-AuditTrailUnableToRecordEvent]

Details:
URL: 
Error: AuditTrailUnableToRecordEvent
Date: 10/8/2025 7:00:52 AM (US Mountain Standard Time)
HTTP Status Code: 500
Business Process ID: 0
User: XXXX
IP: XXXX
Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36 Edg/141.0.0.0

Stack Trace:
Caught exception: Laserfiche.Forms.CommonUtils.Exceptions.LFFormsException
Message: The audit event could not be recorded. [LFF9904-AuditTrailUnableToRecordEvent]


Inner exception: System.NullReferenceException
Message: Object reference not set to an instance of an object.
   at Forms.Auditing.Model.AuditEventType.IsEventRecordEnabled(FormsAuditEvent auditEvent, AuditEventSettings eventTypeSettings)
   at Forms.Auditing.Service.FormsAuditingService.RecordFailure[T](T auditEvent, FormsErrorCode errorCode)

</Data>
  </EventData>
</Event>

Any idea what causes this error? I have tried to disable auditing in Forms, restart services, etc.