App not installed

I just finished up my android game and generated its apk. I signed it, sent it to myself in an email and tested it in my phone (Galaxy S5 Active). Everything was working fine, until I decided to test it in my tablet (Galaxy Tab 10.1), because every time I try to install it, it gives me an error saying "App not installed". I was using the latest JDK, and I saw in the forum some threads with the same problem in which changing to JDK 6 and signing it there made it work. However those threads are from 2013 and when I tried it out it did not work. Help, I really do not know what to do, and I want my game to be available in at least most android devices.

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