Message Oracle ORA-33456 - (ESDREAD08) Discarding compiled code for workspace object because number is a(n) string, which string did not expect to find in a compiled program.

ERROR	(ESDREAD08) Discarding compiled code for workspace object because number is a(n) string, which string did not expect to find in a compiled program.
CAUSE	The type of the specified object has changed.
ACTION	None needed.