I am trying this command to get transaction from bitcoin testnet:

curl  --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "gettransaction", "params": ["txId"] }' -H 'content-type: text/plain;' http://username:password@IP:PORT/

And i am getting following error

{ "result":null, "error":{"code" :-32601, "message" : "Method not found"}, id:curltext}