I have the same issue with the texture pack "Norse Mythology" but without error message.
I push on "update" button to update the texture pack and nothing happen. No error message, no starting update.
I have the same problem since 1 week and it's prevent me from connect myself on multiplayer mode and "erase" the skin what i've done with the skin creator in game.
I realy hope what this bug can be resolved fast.
I'd forgot the precision but it's on the 1.14.1 on switch (the update which add the bees)