Cause: PL/SQL is unable to find and load
a library unit that was previously available. This typically happens when you
try to load a unit which references another library unit that is non-existent
or invalid.
Action: Provide the needed library
unit.

Relared Errors:
PLS-00908: The
stored format of string is not supported by this
release
PLS-00909:
object string is not declared or insufficient privileges to access
object
PLS-00910:
insufficient privilege to inherit from type string
PLS-00920:
parameter plsql_native_library_dir is not set
PLS-00923:
native compilation failed: string:string
PLS-00924:
native compilation is not supported on this platform
PLS-00925:
native compilation failed: Unable to create C file (string
string
PLS-00950: In
this version, PL/SQL tables can not be used in this SQL
statement.
PLS-00951: %s
Feature is not supported by this release
PLS-00960: RPCs
cannot use variables with schema level user-defined types in this
release