Monogame Content.mgcb could not be opened

First of all I’d just like to say I am using MacOS. I have this problem where it does not let me add new content to my program through mgcb. I have tried re-installing all the monogame extensions and it has not fixed the issue. I have also tried opening the content folder from pipeline but that didn’t work. I get the error “Content.mgcb’ could not be opened.” and “Exception has been thrown by the target of an invocation.” when double clicking to open it. I am quite new to this so sorry if my explanation wasn’t great but I would really appreciate the help.

Check this out

will check it out, thanks