whole_func_string: function errorHandler(response, error) {
      response
        .status(500)
        .send(error !== undefined && error !== null ? error.toString() : '')
    }
func_code_string: function errorHandler(response, error) {
      response
        .status(500)
        .send(error !== undefined && error !== null ? error.toString() : '')
    }
func_documentation_string: error handler for failure promises