While trying to import layers, App Layering console displays an error: "An unexpected exception occurred. If this problem continues, contact Technical Support and provide them with the details of this exception".
Looking at the ELM Web logs, we might see the below errors:
ERROR [2832] HandlerHelper: Unhandled System Error while processing 'Query' 'ImportableRevisionsQuery'
System.Threading.ThreadAbortException
at <0x00000 + 0x00000> <unknown method>
at (wrapper remoting-invoke) Unidesk.Ma.Core.Contract.IMaFileShareBaseService:QueryPortableVersionDetails (Unidesk.Ma.Core.Contract.Queries.PortableRevisionDetailsQuery)
at MaFileShareService.QueryPortableVersionDetails (Unidesk.Ma.Core.Contract.Queries.PortableRevisionDetailsQuery ) [0x00006] in <c95541a62bf14d94b006de7142aab25b>:0
2020-02-16 07:02:26,689 ERROR [2832] HandlerHelper: Title: System Error Message: An unexpected system error occurred. Retry the operation or contact technical support. Details: Exception Message: ThreadAbortException Exception Details: