This isn’t an error, it’s trying to stop the Mac libs getting corrupted- though if it’s popping up every time you open the Editor then something is wrong. I’m guessing your source control keeps switching the line endings in these files. If you are using git then you should be able to work around it by adding a .gitattributes file to your project with this line in it *.bundle text eol=lf, to ensure that Mac libs always use line feeds.