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Error responses follow the same format as successful responses, with success set to false and an errorMsg field explaining the issue. You can use the id field to map the error response with the corresponding request. 
{
  "id": "clientID7",
  "event": "subscribe",
  "success": false,
  "ts": 1614141150601,
  "errorMsg": "invalid symbol PERP_BTC_USDC"
}

​
Common error messages

Error messageDescription
invalid symbol <symbol>The requested symbol does not exist
invalid topic <topic>The requested topic is not supported
auth failedAuthentication failed due to invalid credentials
missing required parameter <param>A required parameter is missing