Missing implementation for target platform

I am trying to test out my ane inside a new AIR Mobile AS3 App built in FlashDevelop, specifically Android. When I try to test the project (f5) I get an error:

An implementation for native extension 'my.extension' required by the application was not found for the target platform.

Both the ane and app are built with the same AIR sdk (version 18)

Both have SWF Version : 29

I'm not sure what else to try, or where else to look. I can't find much on the net, and any solutions, correct or otherwise, posted for people experiencing the same error have not helped me. Does anyone know what this error means? It says I need to check the AIR SDK version in my application, but I've confirmed that the versions match up.