problem in building the Webdynpro DC project

Hi,

I was trying to create a new DC for a webdynpro project in the track and i was getting a problem while building the DC.

I was manually adding one jar file to the project srtucture but when i was building that project , jar file is getting disappeared and it is giving compilation errors.

Please help me in resolving this issue

points will be awarded for sure

Bala