Error send transfer

My Code ::
```
coin_base = c.eth_coinbase()
gas_price = ether_to_wei(0.00006)
balance = (c.eth_getBalance(coin_base, 'latest'))
c.eth_sendTransaction(from_address=coin_base, to_address=my_addr, value=ether_to_wei(balance - gas_price),gas=1000000,gas_price=1000000)
```

error
```
raise BadResponseError(response)
ethjsonrpc.exceptions.BadResponseError: {u'jsonrpc': u'2.0', u'id': 1, u'error': {u'message': u'insufficient funds for gas * price + value', u'code': -32000}}
```