PL/SQL compilation fails with no error message

I know this answer is kind of late but just want to let you know that you can also use:

ALTER PACKAGE your_package_name_here COMPILE PACKAGE;

ALTER PACKAGE your_package_name_here COMPILE BODY;

then if warning was shown, you can use the below script to check the error and which lines it resides in:

-- this shows the errors within the package itself

SHOW ERRORS PACKAGE your_package_name_here;

-- this shows the errors within the package body

SHOW ERRORS PACKAGE BODY your_package_name_here;

Conn as FLOWS_020000 and go:

SELECT *
FROM   ALL_ERRORS
WHERE  OWNER = USER;

Or conn as SYSTEM and go

SELECT *
FROM   ALL_ERRORS
WHERE  OWNER = 'FLOWS_020000';