Tumult Hype Animations: "a critical error on this website. Please check your administrator"

I keep getting "a critical error on this website. Please check your administrator"
when trying to replace a .OAM file. and if I just try to add a new one it loads and just gives me an x.. I just tried reinstalling the plug-in and I'm getting the same error. Any suggestions?

Can you turn on debug logs for your Wordpress installation and see what they say? Also, could you share your .oam file? Does a simple OAM file with a single rectangle named 'test' work?