My friend was trying to build his game and it gave a error which confuses me and him and everyone else!

Heres the error message:
helo

Quite obviously, it points to files and then says “Probably the SDK is read-only”
Try checking the files it mentions to see if they’re read only, and making them not read only.

could also try running hub/unity as admin (to see if any difference)

Please attach Editor.log

How can he do that?

Go to the file in the error
right click
click properties
uncheck read-only