code: public static UnitResponse createException(String errCode, Throwable exception, String errMsg) {
          return UnitResponse.createException(errCode, exception).setMessage(errMsg);
      }
docs: Create a exception unit response.
  This method is the same as {@link #createError(String, Object, String)}
  
  @param errCode   error code
  @param exception exception
  @param errMsg    error message
  @return a newly created unit response representing the exception.