Jhuneitor

Hello Long story short i've attempted to mod a game,but,i've stumbled across a problem i cannot seem to find the solution to it for example 1. I decompile the game apk (Using Apk Easy Tool) 2. I compile it (even without modifying anything,simply just recompile it,it says "Compile successful/Sign successful" 3. I install the app but when i try to launch the said app it crashes (stops working) the original app works fine