THIS SHOULD BE MORE THAN A NUCLEAR OPTION ...
I had the same problem on my macbookpro, I donโt know exactly how to fix its data loss, but on my system I have โrm -r ~ / .androidโ, recreated my devices and I can debug again.
It is important to note that it is destructive in that the .android directory is where the android emulator saves the state of the devices that I simulate.
I think the main cause of the problem was due to the old Android SDK, which I removed from my system when I downloaded the android-sdk_r15-macosx.zip file, leaving some crack in the .android directory.
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