Error at line 1:
ORA-00903: invalid table name
Well, the ORA- errors can all be found in the Error Message guide (full documentation can be found on technet.oracle.com). The error you list is saying that a trigger named LOG_ERRORS_TRIG owned by the SYSTEM ID is invalid because there is an invalid table name being referenced in that trigger. You need to find that trigger code and go from there.
This was first published in March 2004