Specified class was not

Hey guys, I'm begginer in zcash mining. I've just set up my miner for pool mining, but I keep getting this output

[13:22:58][0x0000102c] stratum | Connecting to stratum server stratum+tcp://zec-eu.coinmine.pl
[13:22:58][0x0000102c] stratum | resolve: The specified class was not found
[13:22:58][0x0000102c] stratum | Reconnecting in 3 seconds...
[13:23:01][0x0000102c] stratum | Connecting to stratum server stratum+tcp://zec-eu.coinmine.pl
[13:23:01][0x0000102c] stratum | resolve: The specified class was not found
[13:23:01][0x0000102c] stratum | Reconnecting in 3 seconds...
[13:23:04][0x0000102c] stratum | Connecting to stratum server stratum+tcp://zec-eu.coinmine.pl
[13:23:09][0x00003010] Speed [300 sec]: 0 I/s, 0 Sols/s

It's stuck in an endless loop, what have I done wrong ?

can you post you config plz then we can see if its not a forgotten port or somthing.

ussually its somthing small like that