Xcode suddenly stopped running project on hardware: "Could not launch xxx.app: .. No such file.." [closed]

Xcode has stopped being able to run my app, it started directly after I deleted it from the device and attempted to re-install by rerunning it in Xcode (something I've done hundreds of times before).

It says

"Could not launch XXX.app"

"No such file or directory (/Users/Mylaptop/Library/Developer/Xcode/DerivedData/MyApp-ekxcbebfpzkahtfkujyqkcwprzia/Build/Products/Debug-iphoneos/MyApps.app/MyApp)."

I've rebooted the phone, relaunched Xcode, cleaned everything, rebuilt everything. This error message won't go away.

This is with Xcode 4.5 which I've been using since it became available, if I revert to 4.3.2 then Xcode says "Finished running app" but it doesn't actually do anything - the app is neither installed nor run.

I'm completely stuck - unable to run anything on the device anymore.

Any suggestions?

That is really annoying. This error happens in a number of different situations. Sometimes restarting the Xcode, fixes the problem. If not, follow these steps:

Disconnect your device.

Delete the app from your device.

Quit Xcode (Do not just simply close the window, quit it)

Delete derived data folder (~/Library/Developer/Xcode/DerivedData/-gbrvhlvwmpiobxdujegtghggrffp - or something like that)

Now start Xcode once again, connect device and run the project. It should work fine.

from DhilipSiva blog

Try deleting "Required device capabilities" in the -Info.plist file.

You can't require armv7 on a 3G, and you can't require armv6 on any newer device, so just delete this attribute entirely.

I found the answer. The iOS deployment target's version was not the same as my device's OS version.