The pool is not on the proper block height. Hopefully they will get that corrected soon.
In the meantime why not solo mine? the hash rate is very low right now. Just make sure your wallet is matching the block explorer and start solo mining...
What settings are needed in my roicoin.conf to mine with my three PCs at home to one wallet?
Have you tried adding a line like this to the .conf file?
miningaddress=Put-A-Wallet-Address-Here
Yes.
here is my roicoin.conf
server=1
listen=1
daemon=1
rpcthreads=2
miningaddress=my-roi-coin-address
rpcallowip=0.0.0.0/0
rpcport=23110
rpcuser=miner
rpcpassword=password
gen=0