Automatic Backup Error

[craigreilly]

My last backup ran successfully on 3/31. When I looked today, there were no recent backups which run nightly at 8pm. I looked in the running Processes for Windows and saw that the exe was still running, so I terminated it.
In the Windows logs, I see this for 4/1:

Application: 3CXBackup.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.AccessViolationException
Stack:
at <Module>.SLTPL.UpdateWrapper.TProperty<SLTPL::T_field<&PbB::value_PN,char const *,1> >..PBD(TProperty<SLTPL::T_field<&PbB::value_PN,char const *,1> >*)
at BackupAndRestoreDb.ObjectModelToXml.WriteGatewayParameterBindings(TCX.Configuration.GatewayParameterBinding[], System.String)
at BackupAndRestoreDb.ObjectModelToXml.WriteGatewayObject(TCX.Configuration.Gateway)
at BackupAndRestoreDb.ObjectModelToXml.WriteClassInstance(System.Object)
at BackupAndRestoreDb.ObjectModelToXml.WriteObject(System.String, System.Object)
at BackupAndRestoreDb.ObjectModelToXml.WriteObjectArray(System.String, System.Object[])
at BackupAndRestoreDb.ObjectModelToXml.WriteObject(System.String, System.Object)
at BackupAndRestoreDb.ObjectModelToXml.Save(Boolean)
at BackupAndRestoreDb.BkUpRController.BackUpData(System.Object)
at BackupAndRestoreDb.BkUpRController.BackUpThread(System.Object)
at System.Threading.ThreadHelper.ThreadStart_Context(System.Object)
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(System.Object)

When I ran the Windows Task manually this morning, all worked perfect.

Any ideas? Windows 7 Pro. Automatic updates are OFF.