PLS-05018

Hi there

I have a very confusing error from package header compilation (running 19.5 Enterprise on Linux)

As above, message which is usually a warning (PLW-05018) is showing as error and preventing compilation. I cannot find this error in PLS reference, they only go up to PLS-01919. Attaching a screenshot just to prove that I'm not having a mental fit.

Furthermore, this error was not happening at all until I added code in the body.

Package header is very simple:

~~~~~

CREATE OR REPLACE PACKAGE user_admin_tools IS

 PROCEDURE add_access (p_username IN CHAR, p_uid in CHAR, p_schema IN CHAR, p_access_type IN CHAR);