However, there's one problem:
When I start a new game everything works fine, but if I load a save file (even though that's a savegame created WITH your plugin on), this error shows up:
Thanks you've highlighted a rather big error in the Plugin. I'll get to fixing it right away! Looks like I made a stupid decision when writing this part of the code and didn't test enough to catch the issues. Thanks again.
EDIT: I've fixed this issue, download the latest version from Github. Thanks again
@hyuugacln and everyone else who helped track this bug down.
I'm surprised I made such a stupid mistake. Basically, when I very first started on this Plugin, my original attempts were very broken with save files because I was creating Javascript classes with methods that wrote to the save files, however methods cannot be written to save files, so I had to write some messy code to add that feature, only for it to get too complex and unwieldy.
When I started Altimit Movement I decided to avoid this issue entirely, however it looks like I didn't learn my lesson when adding the extra frames support and I made exactly the same mistake! I've now moved the extra frames to the character sprite class (where it logically belongs, too) which isn't saved to save files.