I added kobold2d libcocosdenshion-ios.a static library to my workspace with my project. Everything works fine but I restarted xcode and I got LOT of ARC errors! 30sec before everything works perfect? I don’t delete line of code. Anyone has such a problem? What happened?

If you’re linking to a .a file that contains the binary for the classes you want, then there’s no need for the matching .m files. The library plus any headers should be all you need for building your own app.