Xiaomi Redmi 5 Plus - How to fix Unfortunately, the process android.process.acore has stopped error

Phone: Xiaomi Redmi 5 Plus
Factory OS: Android 7 (Nougat)
Have you updated your Operating System?
Then view tips for the most recent OS version(s): Android 9 (Pie) & Android 8 (Oreo)
Or view tips for all Android versions
Factory OS: Android 7 (Nougat)
Have you updated your Operating System?
Then view tips for the most recent OS version(s): Android 9 (Pie) & Android 8 (Oreo)
Or view tips for all Android versions
How to fix Unfortunately, the process android.process.acore has stopped error
If you see the following error:
Unfortunately, the process android.process.acore has stopped
Then follow these steps:
1.First, go to your phone’s main Settings and select Apps.
2. Then, tap on the menu button usually at the top right left.
3. Select Reset App Preferences.
Alternatively, you can also disable all apps and enable them again one by one until you find the app that has been causing the error.
If none of the above works, you can do a Factory Reset or reboot, instead. Be warned you may lose all of your data when performing a Factory reset!