Today I upgraded CyanogenMod to the latest build (05/10/2015) on my Nexus 4 and installed the newest GApps package. But as soon as I boot my device now, my phone spams crash notifications for Gmail, Youtube and GApps processes. They pop up immediately again after I close them.
I read about solving this by clearing the cache / data of my Google apps. But I can't do anything, those messages block my phone. What to do now?