Access Violation Exception

[jamesmchugh18]

This seems to be an isolated error but was curious if there are any clues to it's origin. We have been using VPE Community Edition for several months, error free.
Today we got this error:
Application: CacheToBiscom.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.AccessViolationException
Stack:
at IDEALSoftware.VpeCommunity.VPEDLL.VpeOpenDocFile(IntPtr, System.String, System.String, Int32)
at IDEALSoftware.VpeCommunity.VpeControl.OpenDoc()
at FaxToBiscom.Service1.MakeTIF(FaxToBiscom.FaxMeta, System.Collections.Generic.List`1<System.String> ByRef)
at FaxToBiscom.Service1.GetNextQ()
at FaxToBiscom.Service1.DoLoop()
at System.Threading.ThreadHelper.ThreadStart_Context(System.Object)
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()

The application is a Windows service and was developed using C# (2015). Server is Windows Server 2008 R2

The line of code being called was one of two:

private string MakePDF(FaxMeta f, ref List<string> filenames)
{
string status = "";
WriteLog("MakeTIF: Creating PDF ", InterName);
VpeControl V1 = new VpeControl();
V1.OpenDoc();
WriteLog("MakeCover: Creating Cover", InterName);

Restarted the service and it processed fine. Any suggestions?

Thanks!

[IDEAL Software Support]

The only explanation is that your service is running out of system resources, eg memory, handles, GDI handles, or anything like that. Are you calling CloseDoc() each time when you have finished generating a VPE document?