.xcodeproj doesn't open in Xcode

Until this evening everything was fine. But now Xcode doesn't open .xcodeproj files. When I start Xcode then click File->Open and then click on .xcodeproj file, the open dialog is showing me .xcodeproj file's contents instead开发者_开发问答 of opening the project. I found on the web that it may be due to an old version of Xcode but I am using 3.2.4.

What format is the volume on which the projects reside ? An Xcode project is actually a bundle, that is a directory containing a project.pbxproj file (this is the only important file) and some user-specific settings files (which are not important). Make sure the project.pbxproj file is present and has appropriate permissions. Also if this is a non HFS+ volumes then that may be part of the problem.

I got same error in my project finally i founded my answer. there total two option for solve this issue.

1. There is need one backup of your project. you can replace your .xcodeproj with old file.
2. you have to create new project and than have to add All old project file in new project.