Contacts app stops all the time i open it.

Question

Every time i try to connect to my Xperia Z2 Contacts app or Phone, it automatically bugs it and i have 2 errors messages, depending on the time :
- the Contacts application has unfortunatly stopped
or
- the com.andriod.phone processing has unfortunatly stopped
And when i finally manage to call someone, it cuts the call within the next 60sec....
Any guess how to stop that happening ? Where the pb is coming from ? It is really becoming an hassle not to be able to telephone on a telephone.
Thank you all, 
Jet K
Solved!
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Answer 1

JetKraze wrote:
Hi Hussain,
Thanks for the reply
What do you mean by clear data ? Reinitiate the phone = erase everything ? 
If I do so, how can i keep all my data and reinstal them later one ?
Thanks 
No. I mean if you go into settings, then Apps, then go in the All tab then look for Contacts, click on it, then scroll down and click the clear data.
Do the same for Phone.
 Before you do this try backing up your contacts. But you have to do this through the Contacts app itself so I think it's going to be hard.
If you can access contacts, then go into it, click the three dots at the bottom and select 'Export Conatacts'.
Hope this helps.