Now I've read the action to take:
Cause: The given library is attached to the form but cannot be located in the search path for PL/SQL libraries.
Action: Make sure that the given library can be found and that it has read permissions set.
But where would this search path be located?
Here's my environment:
O/S: Windows XP Pro (Service Pack 2)
Oracle Forms: Version 126.96.36.199.0
Oracle Database: 188.8.131.52.0