ORA-06508: PL/SQL: could not find program unit being called

ORA-06508: PL/SQL: could not find program unit being called.

Cause: An attempt was made to call a stored program that could not be found. The program may have been dropped or incompatibly modified, or have compiled with errors.

Action: Check that all referenced programs, including their package bodies, exist and are compatible.

You can run this query to find invalid objects, which may cause the ORA-06508 error:

select  *

from all_objects

where status = 'INVALID'

  and owner = 'DEV'; --your schema name