I can't access my contacts on my s4 running cynogenmod 12.1. Why?

[AC Question]

Contacts error message on S4 running Cyanogenmod 12.1. Please help. I have a Samsung Galaxy s4 i9505 and have recently rooted my phone and flashed CM12.2 on my device. Everything seems to be fine however when I click on contacts an error message says 'Contacts has stopped' and closes the app. Here is a copy of the crash report in case that helps: java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:304)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355).... etc. etc. Any help would be greatly appreciated.