Error connecting to ftp server

Hi

My scenario is file->XI->Idoc.

I am taking the file from FTP server using sender file adaptor and FTP protocol.But the messages in the messeage monitoring are showing an general error(syserror) and the error type is XI_J2EE_ADAPTER_XI_HANDLER.

Can you please suggest what needs to be done?

Thanks & Regards

Debraj Roy