Android Studio Update (1.5 To 2.2.3) Breaks Project

So i've updated my Android Studio from Version 1.5 to 2.2.3 and this completely broke my project. I'm pretty new at programming and my app worked just fine before, but now, every s

Solution 1:

Try doing this in build.gradle

buildscript {repositories {jcenter()}dependencies {classpath 'com.android.tools.build:gradle:2.2.3'}}

Solution 2:

If you are trying on devices below Android 7, generate APK by using V1 signature instead of V2. All apps will crash if you select V2 Signature because it is targeting for Android 7.

signature