juspay/hyperswitch · error · syn::Error

error(error_type_enum) attribute not found

Error message

error(error_type_enum) attribute not found

What it means

Error "error(error_type_enum) attribute not found" thrown in juspay/hyperswitch.

Source

Thrown at crates/router_derive/src/macros/api_error/helpers.rs:90

    fn get_type_properties(&self) -> syn::Result<ErrorTypeProperties> {
        let mut output = ErrorTypeProperties::default();

        let mut error_type_enum_keyword = None;
        for meta in self.get_metadata()? {
            match meta {
                EnumMeta::ErrorTypeEnum { keyword, value } => {
                    if let Some(first_keyword) = error_type_enum_keyword {
                        return Err(occurrence_error(first_keyword, keyword, "error_type_enum"));
                    }

                    error_type_enum_keyword = Some(keyword);
                    output.error_type_enum = Some(value);
                }
            }
        }

        if output.error_type_enum.is_none() {
            return Err(syn::Error::new(
                self.span(),
                "error(error_type_enum) attribute not found",
            ));
        }

        Ok(output)
    }
}

enum VariantMeta {
    ErrorType {
        keyword: keyword::error_type,
        value: TypePath,
    },
    Code {
        keyword: keyword::code,
        value: LitStr,
    },

View on GitHub (pinned to 705a321950)

Solutions

1. Add the #[error(error_type = ...)] attribute to the error enum variant as required by the api_error derive macro

When it happens

Trigger: Thrown at crates/router_derive/src/macros/api_error/helpers.rs:90 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of juspay/hyperswitch@705a321950 (2026-08-19). Data as JSON: /api/errors/f1cb7996165a80b8. Report an issue: GitHub.