Cause: The current unit contains a REF
to a target object. During compilation, the REF`s target object was
simultaneously changed by a different session. The current unit is therefore
invalid and needs to be recompiled to pick up the latest definition of the REF
target.
Action: Recompile the unit that has this
error.

Relared Errors:
PLS-00751:
cannot find PACKAGE SYS_STUB_FOR_PURITY_ANALYSIS
PLS-00752:
Table function string is in an inconsistent state.
PLS-00801:
internal error [string]
PLS-00900:
can`t find body of unit `string`
PLS-00901: the
data type of column `string` of table `string` is not
support
PLS-00902: A
READ-ONLY bind variable used in OUT or IN-OUT context
PLS-00904:
insufficient privilege to access object string
PLS-00905:
object string is invalid
PLS-00906:
Compilation is not possible
PLS-00907:
cannot load library unit string (referenced by
string)