Why am I getting an "ERR" while using my Nikon 50mm 1.4G lens?

I'm using a Nikon D610. In the middle of shooting a wedding I switched from my Nikon 50mm 1.4G to my Nikon 70-200mm 2.4. When switching back to the 50mm, any aperture smaller than 2.2 would result in "err" flashing on the camera.

I can shoot fine with wide apertures 1.4 up to 2 on the 50mm, but at 2.2 it results in the err along with anything higher. Switching back to the 70-200mm everything is fine.

Any thoughts? Both body and lens are fairly new.

Thanks!