Strange, I don't even see Android mentioned in my PDE (on Windows), and I haven't seen people complaining about this issue.
Did it worked for you at some time? If so, do you remember an operation that could have made it to stop working?
For some reason, some of my sketch folders contained a file called "sketch.properties". That file had one line stating that mode was set to Android. Just delete that file, and the error message goes away.
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