Getting the same on ETC

ETH: 11/29/17-00:50:48 - SHARE FOUND - (GPU 4)
ETH: Received error: {"id":14,"result":null,"error":[21,"jobnotfound"]}
ETH: 11/29/17-00:50:57 - SHARE FOUND - (GPU 2)
ETH: Received error: {"id":12,"result":null,"error":[21,"jobnotfound"]}
ETH: 11/29/17-00:50:57 - SHARE FOUND - (GPU 0)
ETH: Received error: {"id":10,"result":null,"error":[21,"jobnotfound"]}

on the most shares, whats wrong ?

Also calculated Hashrate on the dashboard dropped by 80%

Seems the pool don't accept the shares :/

Checked Worker Page, 3 Worker working normal all other are makred as offline and all have the same error, jobnotfound

Edit: I deleted now the workers on the Hub Worker overview, restarted the Miner, the error is gone, perhaps this helps