Error, "Identifier 'QU_VERSION.MAJOR_NUMBER' must be declared" when logging onto database in Toad (4268985)

Whenever login in to Toad, the Oracle log captures this error:

BEGIN
if ((QU_VERSION.major_number >= '1') and (QU_VERSION.minor_number >= '8')) then
:retval := 1;
else
:retval := 0;
end if;
END;

By enabling SQL Monitor, the following error is captured on the initial Oracle connection:

Runtime error occurred: 6550 (ORA-06550: line 3, column 8:
PLS-00201: identifier 'QU_VERSION.MAJOR_NUMBER' must be declared
ORA-06550: line 3, column 3:
PL/SQL: Statement ignored)

TOAD checks for the Code Tester as a standard procedure.

WORKAROUND:
None.

STATUS:
Enhancement request ST57192 has been submitted to Development for consideration in a future release of TOAD for Oracle.