Just be careful. When you get this error vue will try to save and copy your last .vue to the .bak and then fail on this save creating a corrupt .vue file. If you try it again vue will again copy the .vue file to the .bak and then fail on the save. This leaves you with two corrupt files. A .vue and a .bak. Ouch. When this happens the first time you should rename the .bak file to something else to have a saved backup that you can get back to. I have reported this problem to e-on.