I did setup and run the private blockchain.
but not able to deploy contract on private network using truffle.

getting this error :
Could not connect to your Ethereum client. Please check that your Ethereum client:
- is running
- is accepting RPC connections (i.e., "--rpc" option is used in geth)
- is accessible over the network
- is properly configured in your Truffle configuration file (truffle.js)

This is my truffle. js :
module.exports = {
networks: {
development: {
host: "localhost",
port: 8545,
network_id: "*"
}
}
};