Oracle Error Message
ORA-06516: PL/SQL: the Probe packages do not exist or are invalid
Reason for the Error
A Probe operation, probably an attempt to initialize the ORACLE server to debug PL/SQL, could not be completed because the Probe packages were not loaded or have become invalid.
Solution
DBA should load the Probe packages. This can be done by running the pbload.sql script supplied with the RDBMS.