[SQL] Error ??

[Tubagus Nizomi]

Hello,
i have an error :

NOTICE:  get_groname: group 0 not found
getTables(): SELECT failed.  Explanation from backend: 'pqReadData() -- 
backend closed the channel unexpectedly.
        This probably means the backend terminated abnormally
        before or while processing the request.

what can i do ??
help me please

Nizomi 

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PostgreSQL 6.5.3 on sparc-sun-solaris2.6, compiled by gcc 2.95.1