Xcode build fails, need help ASAP!

I will just explain to you the issue quickly, so I got Xcode this time last year thanks to your video ironically and set a GPX location plugged it from my laptop to my phone and it worked fine and worked perfectly fine for a year excluding a few times I had to update my Mac etc it was mostly fine. I used it nearly everyday until last month I went on holiday and didn’t use it and when I came back I received an email saying my subscription had ran out so I renewed it and got a confirmation and everything I am part of the apple development team again got a receipt everything. Today I went into Xcode did what I usually do with the gpx file and everything as soon as i clicked build it said build failed (1) and then said at the bottom of the error codes ‘code not even signed’ even tho I’m signed in and everything I looked everywhere and hardly anyone has had this problem the people that have said something about deleting paddlemass, but I am not very tech savvy so I am unsure how to do that. It’s an issue with the Mac Xcode app I believe not my actual phone, because i also tried it from my iPad it’s not actually building, it’s probably a simple fix if u know what u r doing. Even if I gave u my Apple ID and u took a look