vb error 'run-time error '13', type mismatch when starting SAP BEX Analyzer

Dear experts,

I encountered the above error whenever I opened the BEX analyzer either from the start program or call sap transaction 'RRMX'.

My desktop is currently running BEX 3.50 with patch level 5 and office XP and my SAPGUI version is SAPGUI 6.4 compilation 2, patch level 11.

I have tried installed and reintalled SAPGUI and also downloded the latest patch from the net but still having the same problem.

Any input/help will be greatly appreciated.

Thank you,

NCW