Large Tgui error need help

[Halford_Steel]

My tgui has had an error for a long while and I am at a complete loss on how to fix it, i have done all the normal steps one should take in fixing these sort of things. I have uninstalled and re installed byond like 5 times trying to fix this error. Can anyone help me find a solution. 

Here is a screenshot of the error.
https://imgur.com/a/dDaikJ4