FRM-40039 in Oracle forms 12c
I am trying to set up a new Oracle Forms 12c instance to start testing that our application works in 12c (it is currently deployed using 11g) but I am getting an FRM-40039: Cannot attach library X while opening form Y. I have confirmed that the plx is in the forms path (it is in the same folder as the form) and that there is no hard coded path in the attached library within the form.
This is running on a Windows Server 2012 R2 server.
Any ideas of where the problem may lie are greatly appreciated.