From zcash flypool it says
Because of performance issues with the Zcash client we are unable to send payout transactions to z addresses! Therefore DO NOT use z addresses to mine on the pool.
What address then we enter in claymore?
you should use t addresses.
Announce about z addresses made some where in OCT or NOV 2016, so it's truly shouldn't care you. Nowadays all are using t addresses of ZEC.