All my images and colors are gone, leaving only the blue outlines of Xcode 9

Hi everyone I am working with Xcode 9 beta 9.0 (9M136h) beta. it all worked fine, but then suddenly became sluggish. i reset Xcode and my computer and now i get this when i open my project. all my images and colors, nabbers and navigation controllers are missing, but they are replaced with blue lines. If I run the program it works fine, and if I open it in Xcode 8 all images are shown. Has anyone else had this?