unfortunately the process com.android. phone has stopped

pls help me i am newbie for android. when someone is calling me on my xolo a500s ips its giving an error msg that ''UNFORTUNATELY THE PROCESS COM.ANDROID.PHONE HAS STOPED''. so i am unable to recieve anu call.
allready tried below methods but nothing happend

1. opend setting>app>all>phone>app info>clear data and then rebooted

2.made a factory reset

3. tried by changing sim and memory card

4. force closed google services,contacts,gmail.fb

5. setting>app>menu>reset app prefrence
but nothing happend pls help me

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