There has been a critical error on this website””

Hi,

I installed Multiline File Plugin and have followed all the steps as shown, but I’m facing an issue where, after I add all the files and try to click submit button, it shows

“There has been a critical error on this website”

I haven’t found any solution to fix the issue as of now ??
Any help would be highly appreciated!

Thanks!

The page I need help with: [log in to see the link]