How to fix: Xcode cannot be opened because of a problem?

After installing Xcode 4.0.2, I get this error when I try to launch it by double-c开发者_JAVA技巧licking on an existing project:

Dyld Error Message: Library not loaded: @rpath/DevToolsFoundation.framework/Versions/A/DevToolsFoundation Referenced from: /Developer/Developer/Applications/Xcode.app/Contents/MacOS/Xcode Reason: image not found

Launching Xcode via the dock and opening the project from inside Xcode works fine. Also note that doing a repair install of Xcode did not resolve the issue. I haven't tried completely uninstalling Xcode and installing from scratch, but I would prefer to avoid that as I have my IDE nicely customized the way I like it.

Update: I just tried a complete uninstall of Xcode via sudo Developer/Library/uninstall-devtools --mode=all then rebooted and reinstalled. Still having the same issue.

Before you reinstall, make sure your project file is set to open with the expected copy of Xcode 4. Select it in Finder, press Cmd-I, and make sure the Open With... popup is set to the right copy of Xcode 4.

According to the discussion below, the problem is that it is not in the /Developer/Applications/ folder. However, I think that is just a clue to the source of the problem, because Xcode is supposed to work in multiple locations. It is possible that Xcode sets fixed paths when installed and can't be moved. Did you happen to move it after installing?

http://www.iphonedevsdk.com/forum/off-topic/35948-xcode-crash.html

It is the ALIAS that is busted, not Xcode. If you reinstalled Xcode, you should make a new alias for your Dock or Desktop or wherever. Delete the old alias as it is no good any more.

Xcode (should) install in /Developer . You can get to that by going to your hard drive named something like "Macintosh HD". Make a new alias from there.