How to get script to work (no dog) and error trying to export Mega Man fangame

[GitExplorer1243]

I am trying to export a non-Undertale GMS 1.4 project, but even if I download and put the script in UMT or the SampleScripts folder, it doesn't work and always shows the dog dancing animation. Can anyone help me so it can work, and I can get the project to export?

[GitExplorer1243]

I click the script and it works, and it shows the dog when I click the button.

But then I get this huge error when trying to export (I'm trying to export MAGMML Episode Zero, and it shows when it reaches about 4,200 of the 7,397 things needed to export):