Have you ever got the error message “The process android.process.acore has stopped working” on any of your Android devices? This occurs due to the same contact featuring in multiple accounts that are being synced on Android, which leads to a conflict. Follow this tutorial to find out how to fix the issue.
Before proceeding further, let me warn that performing this procedure will result in deletion of your contacts from the device. So, make sure you back up all of them and then continue to below steps.
Step 1: From your Android home screen, tap/press on Menu button and then choose Settings.
Step 2: Now choose Applications.
Step 3: Tap on Manage Application.
Step 4: Tap on All tab to see the list of all applications available on your phone.
Step 5: Scroll down to Contacts Storage and tap on it.
Step 6: From new screen tap on Clear Data option.
This solution was reported to work on devices such as Lenovo A1, Droid RAZR, Nexus 7, Asus TF101, Galaxy Note, Droid 4, HTC Sensation, Galaxy S2, and HTC One X. Use the comment section below and let us know if it worked on your device.