you are right, it’s error of window corona, i have used a mac to build, it’s ok. ( the same code, same keystore ).
Good I try using a mac and see if it build Thanks
hey guys i am very happy to tell you i solved the problem. this error means you need to update your corona sdk or uninstall it and reinstall instead of using a mac i just uninstall corona from my pc and reinstall it and it works fine. hope this help anyone that is experiencing this issue 
I can confirm that updating did fix the problem for me. I was using build 2013.1076 and experienced the same issue (“debuggable apk”).
Reinstalling it didn’t help.
I happened to have build 2013.1137 downloaded so I tried installing that. Same issue.
Tried installing build 2013.1202 (last public release before Graphics 2.0 was included) and the problem does not occur in this build.
Yes the new public release should should solve the problem also the new version comes with support for the ouya android game box. I am guessing the reason why that error occurred was the corona sdk server did not built properly. So all you. Guys out there with the old version go and install the latest version of the corona sdk
Corona Labs please let me know when you fix this issue on your build servers. It is building .apk incorrectly or in such a way Google Play thinks it’s set for debugging. Everything was fine a week or two ago when this problem did not exist.
I can also confirm that updating to the newest release fixes the issue with Google Play saying it’s a debuggable APK.
Best regards,
Tomas
Yes I will say this again updating your corona sdk to the newest version will solve this problem or use a mac to build your apk but if you are a pc user just uninstall the old version and download the latest version hope this help:)
From sean @ Boxing Studio Games
This was fixed before the public build 1202. If you are using an older version, please upgrade to at least 1202.
Rob
It’s true build 1202 fixes the problem. Unfortunately, my code runs on 2011.704a or earlier. Builds after 704a cause my game to have physics problems. I’ll see if I can update my game code to work correctly with 1202.
Yes you may need to update your code because when I first updated my corona sdk I had some scaling issues on some divices so I had to use contentWidth/2 and contenHight/2 to sacle backgound properly so yes you may need to update some of your code
When a vendor changes something that requires us to change, the only choice is for us to fix it in the next build. We can’t make Google go back and undo this.
Rob
Same Error in Windows, Please Help, I’m Starter.
Hi, Thanks for this I was going crazy about this and thinking that was my mistake.
I hope this get ready soon.
Please update to the latest version of the corona sdk
Did you select a keystore other than “debugkeystore” in the Corona SDK build screen?
yes i did just that looked for the keystore i made and build the app but google is saying it is in debug mode
The same error , today. It worked before with this keystore. I Don’t understand 
could some one tell us why this is happening thanks for help
please hungry up, i have to update version in google play