Sage 500 5.6A ERP - crashes when I run my custom report with this error message.

We use Sage 5.6A 500 ERP at our offices.

Whenever I run a custom report (to generate sales numbers), 50% of the time the program will crash when I try to export it into an excel data file. 

The report runs FINE, we can see the information in the report generated by ACCPAC, but it's only when we try to export it into a data file does the program crash. 

Here is the error:

Problem signature:

  Problem Event Name:                        BEX

  Application Name:                             accpac.exe

  Application Version:                           5.6.0.53

  Application Timestamp:                     4df2c9ff

  Fault Module Name:                          dtsh.dll

  Fault Module Version:                        6.1.7600.16385

  Fault Module Timestamp:                  4a5bc8ec

  Exception Offset:                                00001c03

  Exception Code:                                  c0000005

  Exception Data:                                   00000008

  OS Version:                                          6.1.7601.2.1.0.16.7

  Locale ID:                                             1033

  Additional Information 1:                  a7aa

  Additional Information 2:                  a7aa91f17ea749d42a4de3b390fa5b3d

  Additional Information 3:                  a7aa

  Additional Information 4:                  a7aa91f17ea749d42a4de3b390fa5b3d

The crash typically happens when we get to the screen where we want to save the data file.

Any help? Thank you!