Once again I\'ve made the mistake of updating Eclipse with the latest Android SDK/tools and have rendered it useless.
Running Eclipse on a Mac.
When I try to
In my case it was related to "No system images installed for this target" even though Image is installed.
Following this answer, I moved c:\adt\sdk\system-images\android-23\default\x86 up one folder to c:\adt\sdk\system-images\android-23\x86, and after that I got the error:
Unable to find a userdata.img file for ABI armeabi...
On a hunch, I created a symlink/junction to the original folder, and it worked. I used this:
mklink /j "c:\adt\sdk\system-images\android-23\default\x86" "c:\adt\sdk\system-images\android-23\x86"
It's just that you need it in both folders. I used a junction instead of simply copying the folder so as not to waste space.