I flashed cyanogen mod 12 on my galaxy s3. Once I did that I flashed gapps but when I went to turn my phone on, every single app crashed and kept crashing literally over and over again. I couldn't do anything but press OK when they crashed because when I tried to, another one just popped up. Is there any way that I can just apk the Google play store or something.
The error occoured because the gapps version you installed didnot match the version of os installed. You can find the minimal gapps edition here.Since you are running cm12 you should download download the one meant for android 5.0.x