Runtime Error! Program: C:\...\busobj.exe R6025

We have BOXIR2 and VB macro.

In Desktop Intelligence report i have a macro to export report in pdf, xls and html format.On first refresh it works properly and document gets exported.However when i refresh the report second time getting error u201CRuntime Error! Program: C:\...\busobj.exe R6025 u201C- pure virtual function call

Thanks,

Peter