Anyone have a solution to the above error?

It happens at a client on this line: This.crReport = This.crApplication.OpenReport(This.ReportFileName, 1)

I've read the messages here on invalid TLV record. As far as I can see all required files are installed and registered on the clients PC.

The error in full is:-
OLE IDispatch exception code 0 from Crystal Reports ActiveX Designer: Invalid TLV record.

Any suggestions?

Cyril.