listMarketBook with error reply

[tonbet]

Hi guys,

I´m doing this request with this json post data:

'{&lf; "jsonrpc": "2.0",&lf; "method": "SportsAPING/v1.0/listMarketBook",&lf; "params": {&lf; "marketIds": [ "1.112314551", "1.112314551", "1.112314553" ],"priceProjection": ["EX_BEST_OFFERS"] },&lf; "id": 1&lf;}'

URI:"https://api.betfair.com/exchange/betting/json-rpc/v1"

and getting:

{"jsonrpc":"2.0","error":{"code":-32602,"message":"DSC-0018"},"id":1}

Anyone know why?

[AlgoTrader]

There is my working example:
It seems your JSON is invalid, please have a detailed look to priceProjection

Request:{
  "jsonrpc": "2.0",
  "id": 3,
  "method": "SportsAPING/v1.0/listMarketBook",
  "params": {
    "marketIds": [
      "1.112335290"
    ],
    "matchProjection": "NO_ROLLUP",
    "priceProjection": {
      "priceData": [
        "EX_ALL_OFFERS",
        "EX_TRADED"
      ]
    }
  }
}