Help required with TRex Miner plz :)

Help please, first time miner:TREX Miner – Cuda 9.1 – NVidea GTX 970 (using older card to get used to setup and such before investing)

Getting errors:

failed to subscribe, failed to get extranonce2_size

failed to subscribe, JSON RPC call failed: type not convertable to string

using:

u/echo off

:start

t-rex -a x16r -o stratum+tcp://rvn.2miners.com:6161 -u RQZXWSKNVrzjAqMqP6v1ukG2BRgDiQaAVp -p x

goto start

Any help is appreciated 🙂 TIA