title: Xcode cannot run using the selected dvice
body: <p>i post this question because none of the solutions posted to
  already existing threads helped for me.</p>
  
  <p>today morning everything worked fin, i pressed on the Run-Button and
  my iOS-Simulator stated out of Xcode showing my implemented App.</p>
  
  <p>few hours later it shows this error-message:</p>
  
  <p>"Xcode cannot run using the selected device. No provisioned iOS devices
  are available with a compatible iOS version. Connect an iOS device with 
  a recent enough version of iOS to run your application or choose an
  iOS simulator as the destination."</p>
  
  <p>My Targets iOS SDK is 6.1
  Under Summary i chose as Device an iPad (as before)
  Under Summary i chose 6.1 as Deployment Target.</p>
  
  <p>I have no "real" iOS Device at home so i always used the simulator.
  As i said, since today afternoon not working.</p>
  
  <p>what could be the prblem?</p>