Verify own hostname (localhost) failed, DBIF_RSQL_INVALID_REQUEST

Hi to all,

when i try to login to the SAP server, i am getting an ABAP Runtime Error as DBIF_RSQL_INVALID_REQUEST. Also it says that The current ABAP/4 program terminated due to an internal error in the database interface.

I could not do anything in the GUI other than clicking the LOGON button and the error messages. Please help me to solve this issue.

localhost is my system name.

Thank you all...