Android app doesn't launch in simulator or hardware

My app used to run, but lately I've been getting this odd error:

#  guarantee(_name_index != 0 && _signature_index != 0) failed: bad constant pool index for fieldDescriptor

How can I开发者_JAVA百科 get my app to run in the simulator or on my phone again?

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I was accidentally running it as a Java app instead of an Android app. My bad. Don't make my mistake young grasshoppers.