Error starting game and says i dont have pathwerk

All day I have been getting the message ‘error there was an error starting your game. Please wait a few minutes’ when trying to play on both my computer and phone. Additionally, every time I start Hearthstone, it says I’m missing Pathwerk in my collection and that it’s invalid in my deck. I have to remove it and add it back in every time. It’s quite frustrating, and it has been going on for several weeks.

delete the deck and rebuild it fully