PureMessage Store Scanning .NET error

I get e errors whenever PureMessage tries to perform store scanning.  This is Exchange 2016 on Server 2016:

Error 1 (Event ID 1026)
Application: SavexSrvc.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.NullReferenceException
at EWSStoreScanner.EWSMailboxContainer.getMailBoxProperties()
at EWSStoreScanner.EWSMailboxContainer.getMailBoxes()
at EWSStoreScanner.EWSMailboxContainer.iterateAllMailboxes()
at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
at System.Threading.ThreadHelper.ThreadStart()

Error 2 (Event ID 1000)
Faulting application name: SavexSrvc.exe, version: 5.0.3.71, time stamp: 0x57598609
Faulting module name: unknown, version: 0.0.0.0, time stamp: 0x00000000
Exception code: 0xc0000005
Fault offset: 0x00007ffbfd027f6d
Faulting process id: 0x3f9c
Faulting application start time: 0x01d2eb577af86412
Faulting application path: G:\PureMessage\Bin\SavexSrvc.exe
Faulting module path: unknown
Report Id: 9437ff9c-8a19-45df-b264-593a4e748160
Faulting package full name:
Faulting package-relative application ID:

Error 3 (Event ID 7034)
The Sophos PureMessage service terminated unexpectedly.  It has done this 724 time(s).


Any ideas?  I tried googling