description

# ServiceExtensionResponse.error constructor

ServiceExtensionResponse.error(

1. int errorCode,
2. String errorDetail

)

Creates an error response to a service protocol extension RPC.

Requires `errorCode` to be invalidParams or between extensionErrorMin and extensionErrorMax. Requires `errorDetail` to be a JSON object encoded as a string. When forming the JSON-RPC message `errorDetail` will be inlined directly.

## Implementation

    ServiceExtensionResponse.error(int errorCode, String errorDetail)
      : result = null,
        errorCode = errorCode,
        errorDetail = errorDetail {
      _validateErrorCode(errorCode);
    }