VBA Close With Save Causes Runtime Error

[Jefferson2512]

I'm running a macro that closes the current workbook. The macro is run by an icon on the QAT and the code is in the MyWB.xlsm project. When the last VBA command is executed (ActiveWorkbook.Close SaveChanges:=True)), I get the 'Automation Error. Exception Occured'. When MyWB.xlsm is active and I run the same code in the 'Personal.xlsb' workbook, the error does not occur.

Any help wuold be appreciated. Thanks.