Hi, im having issues with editing mods I've downloaded during my time playing serious sam, I've looked around for answers but to no anvil. I've done the path text file thing with changing the path to the workshop content

($E:/Steam/steamapps/workshop/content/564310/ )

but after having issues with that, i managed to get a little further but now i'm at a complete stop due to an error I get in serious editor.

The error I get is this


I've looked online for this and there was only two posts, one with someone who was never answered and another on a new update for serious sam editor back in 2014 which apparently fixed for him with beta stuff. Except there is an issue for me as i can't do anything with the betas its unavailable and needs a code.

I've also reinstalled a mod as a person told a guy that doing that has fixed stuff for him but nothing has changed for me so im at a complete stand still as to where to go now as there's little posts with no additional fixes.

Thanks to anyone willing to help.