I've switched from Cyanogenmod to LineageOS using the experimental build and then flashing a nightly build afterwards. This worked great except for the fact that the phone and contacts app kept on crashing. I reflashed the nightly and -- to be sure -- this time I flashed the GApps immediately after as well.

I've tried both the Gapps "stock" package and the "micro", because I thought the problem could lie within Hangouts. It didn't.

When I boot my phone up, I get android.process.acore has stopped working (or something along the lines of that; I'm using the German translation) and this message get's repeated everytime I try to open the phone, messages or contacts. All other apps seem to work fine.

Interestingly enough, I can get called. The aforementioned error message is displayed, however, I can tap on Kill app without killing the conversation.

  • "I reflashed the nightly and -- to be sure -- this time I flashed the GApps immediately after as well." - this only applies to fresh installs. For anything older that doesn't have GAPPS before... back up and do a fresh one.
    – Andy Yan
    Feb 26, 2017 at 14:07
  • What's the android version in cyanogenmod, and on lineage? phone and contacts are system apps, may be you were in different android versions.
    – Rahul Gopi
    Feb 26, 2017 at 15:19
  • @AndyYan I reflashed the nightly w/o gapps and manually downloaded the Google Phone app, sadly w/o any success. I hope I understood you correctly.
    – theCed7
    Feb 26, 2017 at 15:23
  • @RahulGopi Damn, that actually could be the problem. I was on one of the latest CM 13 nightlies for my LGG3 and didn't reliase that Lineage was already on Android 7.1. What's the best way to fix this?
    – theCed7
    Feb 26, 2017 at 15:26
  • @theCed7 A matching version of GAPPS, I guess?
    – Andy Yan
    Feb 26, 2017 at 23:51

1 Answer 1


If you have the cynogenmod zip file somewhere stored then I think it is very easy to restore it. Just extract the cynogenmod on your computer and go to system->apps and copy the apks which are not working (eg.Phone, Contact in your case). Now also extract the nightly build which is giving you errors and go to system->apps and find the phone.apk and contacts.apk and delete it. Now just paste those apks which you had copied from CynogenMod and compress the modified Lineage OS in zip format. Now you are all done. Flash the newly created zip file and comment here if it worked (which is going to work in most case).

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