Yup, I think you have a main-net address This is what my testnet dash.conf looks like, and it sits OUTSIDE of the testnet3 folder (in regular folder)so I tried to get some tDash...and it says I have an invalid wallet address?!?
rpcuser=Me
rpcpassword=JKHIUTY*Giuhuiy8ytguih90u
server=1
addnode=128.127.106.235:20004
testnet=1
masternode=1
masternodeprivkey=testnet wallet's mn priv key