the trigger i tried to create was like this
create or replace trigger user_priv
before create or drop on database
if ( user in ( 'PVNET') )
'You are not allowed to do this' );
and the error its now giving is
create table t(x number)
ORA-04098: trigger 'DDL_TRIGGER' is invalid and failed re-validation
SVRMGR> !oerr ora 4098
04098, 00000, "trigger '%s' is invalid and failed re-validation"
// *Cause: A trigger was attempted to be retrieved for execution and was
// found to be invalid. This also means that compilation/authorization
// failed for the trigger.
// *Action: Options are to resolve the compilation/authorization errors,
// disable the trigger, or drop the trigger.