Show error when connect Company Database by DI API in 2004B

Hi

I use the DI API to connect company database in 2004B. I can get the company lists by SAPbobsCOM.CompanyClass.GetCompanyList().

I write a program to testing the connection that show two different result in client and server side.

- It show the error -2147221164 (Class not registered), when connect company database in client PC.

- The same program run in server, it connected.

I already checked my config as below

- SAP 2004B is installed 7.20.145 SP:00 PL:25

- SAPbobsCOM67.dll is 6.70.188.0 version, and "Special Build Description" is 21.

The client and server side are same config.

Any ideas how I should handle this?

Thanks

Winson