server closed the connection unexpectedly

["Muhyiddin A.M Hayat" <middink@xxxxxxxxxxx>]

Dear all,

 

i'm unable to connect postgres server with error :

 

C:\Program Files\PostgreSQL\8.2\bin>psql -U postgres siakad
Password for user postgres:
psql: server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.

 

 

somebody help me please