Oracle Solution for Error ora-12495

ORA-12495: cannot disable an enabled level, category, or release category

What triggered the Error:

You attempted to disable a level, category, or release category that had previously been enabled. An enabled label definition may be exist in some database label, so cannot be disabled.

What should we do to fix it:

If the label definition is no longer valid, change its name to one that identifies it as invalid. When any labels are converted to character strings, the new label definition will be used.