com.android.phone constantly crashing

I recently updated my brand new out of the box one max from version 4.3 stock to the latest sprint ota, updated profile and prl and then unlocked the bootloader and rooted the device via twrp. After following all these steps, I went to go install the latest CM12.1 nightlies and find the com.android.phone app constantly crashing on all calls. I cannot make nor recieve any calls, but LTE and text works. Is there any fix I should go about? I am trying to install a sense rom, update the profile/prl and test gps and make calls and then clean flash another cm rom.

Any thoughts from anyone? Also to add insult to injury, I am unsure if I HAVE to be S-Off to be able to flash cyanogenmod roms.