Transition between Photoshop and Fresco

Hello all, I am learning how to use Photoshop and Fresco.  Until recently I have been able to successfully transition back and forth between the two in either direction.  Running full version of Photoshop on my Mac and Fresco on my Ipad - synching through CC.  Now I am getting a very unhelpful message that says "unexpected error occured" when moving from Fresco to Photoshop and nothing else.  Any tips on how to solve this?  Your help would be much appreciated.