Opening Crystal Report in SAP B1 2007

Hi,

I am trying to open a crystal report in SAP B1 but when I tried to run the report, am getting the following error

"Could not load file or assembly ' CrystalDecisions.Windows.Forms, Versions = 12.0.2000.0, Culture = Neutral,

Publickey token.....

The system can not find the file specified.

I would really appreciate your help to correct this error.

Thanks,

Kishor