This occurred after I had finally set up Google Glass to sync with ADB

DDMS] device unauthorized. Please check the confirmation dialog on your device.
   

The solution:
echo %ANDROID_SDK_HOME%
   
1. setx ANDROID_SDK_HOME "E:adt-bundle-windows-x86_64-20140321sdk"
2. unplug device
3. adb kill-server
4. adb start-server
5. plug device

*** For the adb instructions you need to navigate to your ADT/sdk/platform-tools folder where adb resides