Error With Rest Server HyperLedger

I am following the tutorial here:

https://hyperledger.github.io/composer/tutorials/queries.html#step-six-test-the-rest-apis-and-create-some-data

When I try to post the data,

I get the following response:

{ "error": { "statusCode": 400, "name": "SyntaxError", "message": "Unexpected token \n in JSON at position 38", "body": "{\n \"$class\": \"org.acme.biznet.Trader,\n \"tradeId\": \"TRADER1\",\n \"firstName\": \"Jenny\",\n \"lastName\": \"Jones\"\n}", "status": 400, "stack": "SyntaxError: Unexpected token \n in JSON at position 38\n at JSON.parse ()\n at parse (/usr/local/lib/node_modules/composer-rest-server/node_modules/body-parser/lib/types/json.js:88:17)\n at /usr/local/lib/node_modules/composer-rest-server/node_modules/body-parser/lib/read.js:116:18\n at invokeCallback (/usr/local/lib/node_modules/composer-rest-server/node_modules/raw-body/index.js:262:16)\n at done (/usr/local/lib/node_modules/composer-rest-server/node_modules/raw-body/index.js:251:7)\n at IncomingMessage.onEnd (/usr/local/lib/node_modules/composer-rest-server/node_modules/raw-body/index.js:307:7)\n at emitNone (events.js:105:13)\n at IncomingMessage.emit (events.js:207:7)\n at endReadableNT (_stream_readable.js:1059:12)\n at _combinedTickCallback (internal/process/next_tick.js:138:11)\n at process._tickCallback (internal/process/next_tick.js:180:9)" } }

I will appreciate any guidance on this, because as far as I can tell, I have followed the docs