Unable to create RFC Destination using TREX admin Tool

Hi Experts,

we intsalled TREX 7.0 on windows 2003 with NW2004s java edition successfully.

But at the time of configuring TREX with ABAP client by creating RFC Destination using TREX admin tool, we are facing problem. we are unable to create an RFC destination from TREX admin tool by clicking on the button RFCDestination(sm59)

Thats why, when we tried to create a new connection in SAP under sm59 screen there also we got "Connection Error (CPI-C error)".

PLZ guide me how to configure TREX with ABAP client successfully

Regards

Phani