I have a OnePlus One, never rooted or modified the OS. Today I updated the OS from YOG7DAS2K1 (COS12.1) --> ZNH0EAS26M (COS13) via OTA incremental update zip from Recovery (stock).
I wiped cache and user data from Recovery after update.
Phone seems to be fine so far, except this:
Whenever I sideload an APK, although the installed app works fine, an error message pops up at the end.
"Unfortunately, Package Installer has stopped"
I tried wiping cache, rebooting, reinstalling those apps, but the error appears anyway.
What seems to be the problem here?