Trying solo mining, downloaded gmc-windows-4.0-amd64.exe and followed the instructions on musiccoin web site, i.e. started gmc like this:


gmc-windows-4.0-amd64.exe --rpc --rpcaddr "192.168.1.4" --rpcport 8545

...
0410 22:05:23.322342 node/node.go:366] HTTP endpoint opened: http://192.168.1.4:8545
...

It synced the whole block chain, then I tried genoil ethminer-0.9.41-genoil-1.1.7

ethminer -G -F  http://192.168.1.4:8545 -O 0x...... --opencl-platform 1

But it consistently gives this error:

Found suitable OpenCL device [Ellesmere ] with 4294967296 bytes of GPU memory
  m  22:07:36|main  Getting work package...
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  22:07:38|main  Getting work package...
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  22:07:40|main  Getting work package...
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  22:07:42|main  Getting work package...

What am I missing ?