Help Force close error - cannot access groups

[evolight]

Everytime I try to open 'contact groups' the following window pops up:

Sorry! The application People (processcom.android.htccontacts) has stopped unexpectedly. Please try again. FORCE CLOSE

I have already tried the following:
- all system updates under >> menu > system updates
- soft & hard reset

I cannot create new groups or even access existing ones. Does anyone know a solution?

 

[evolight]

I am considering a factory reset if there are no other options out there. Can't find a way around this force close.