ORA-00603: "ORACLE server session terminated by fatal error"

on this command:

exec DBMS_STATS.GATHER_DATABASE_STATS(estimate_percent => DBMS_STATS.AUTO_SAMPLE_SIZE, block_sample => TRUE, method_opt => 'FOR ALL COLUMNS SIZE', cascade => TRUE, options => 'GATHER');

I am getting this error:

ORA-00603: "ORACLE server session terminated by fatal error"

I don't understand what to do right now, pls help.

ORACLE : 9.2.0.3
SERVER : Sun Solaris Received on Mon Mar 19 2007 - 00:31:42 CDT