Can't delete .java models

Every time I go into the resources tab and go to 3D models, if I try to delete one of my custom models, it never opens the delete page and my cursor does the loading animation.
The program doesn't crash, and I can still edit and save mod elements, but my cursor will always be doing the loading animation and it will never open the delete menu, even if I press delete or the little button in the top-right. I've tried restarting the program, my computer, nothing works. Please help!