I use Nokia Lumia 920 for developing apps. All is working OK, but once when I've tried to debug app I had next error: "Application could not be launched for debugging. Ensure the target device screen is unlocked and that the application is installed." I've checked and found that app is installed and screen is unlocked. I tried to reboot pc and phone, but this issue appeared again. Then I reset my phone. After reset application work normally. But later this issue occured again.