Android Packing Failed

I’m trying to package my android game and I got all the keystore and google play stuff! then when I package without " for distribution", build succeful, but when I go with “for distribution” build fails.
I’m using 4.15, so I guess I need to change to 4.17 cause of my new google API, the SHA1, I guess I need the latest SDK, I don’t know! But the problem is that when I try to upgrade, my project loads and I got “Unreal engine has crashed”. It this the real problem? Why can’t my project upgrade from 4.15 to 4.17?
Please! I need help! ty

My logs: link text