Hello. When I mine at Nicehash I got this error time to time:

18:52:30:073   10a0   Error in server response
: {"jsonrpc":"2.0","id":1,"error":{"code":24,"message":"Unauthorizedworker"}}

Haven't this error when mining with -nofee option or at dwarfpool


And is it possible to make switching between pools from pool.txt without restarting miner?