I want to send PTA, I failed to send with this command.

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_sendTransaction","params":[{"from": "0xf1714d1d16087b379a317b32019236337fa18661", "to": "0x7a9ee17c2221296adad0b4a1337d0d18b935f46c", "value": "100"}],"id":1}' 127.0.0.1:8545

The error message is as follows:curl: (7) Failed to connect to 127.0.0.1 port 8545: Connection refused


Please help me!