Please don’t hijack threads for your own issues, create your own. This is a generic error, we don’t need a single thread detailing every time anyone gets it TBH. If you make another post, tag me in and I’ll happily go over it with you!
So the error tells you exactly what the problem is and where so read what it says. Unless you don’t know what NULL or an argument means but if that’s the case then it’s worth asking that instead.
Also, when you post code, please always use code-tags and not plain text.