cube-js/cube · error · minijinja::Error

Error while calling method: {}

Error message

Error while calling method: {}

What it means

A Python object exposed to a Jinja template raised when one of its methods was invoked: python_obj_method_call_sync returned an Err (Python exception, bad arguments, or missing method), which is wrapped here into a minijinja InvalidOperation error. The original Python error text follows the colon and is the key diagnostic.

Source

Thrown at packages/cubejs-backend-native/src/template/mj_value/python.rs:141

    }

    fn call_method(
        &self,
        _state: &mj::State,
        name: &str,
        args: &[Value],
    ) -> Result<Value, mj::Error> {
        let obj_ref = &self.inner;

        let mut arguments = Vec::with_capacity(args.len());

        for arg in args {
            arguments.push(from_minijinja_value(arg)?);
        }

        match python_obj_method_call_sync(obj_ref, name, arguments) {
            Ok(r) => Ok(to_minijinja_value(r)),
            Err(err) => Err(mj::Error::new(
                minijinja::ErrorKind::InvalidOperation,
                format!("Error while calling method: {}", format_python_error(err)),
            )),
        }
    }

    fn call(&self, _state: &mj::State, args: &[Value]) -> Result<Value, mj::Error> {
        let obj_ref = &self.inner;

        let mut arguments = Vec::with_capacity(args.len());

        for arg in args {
            arguments.push(from_minijinja_value(arg)?);
        }

        match python_obj_call_sync(obj_ref, arguments) {
            Ok(r) => Ok(to_minijinja_value(r)),
            Err(err) => Err(mj::Error::new(

View on GitHub (pinned to 7d981676b3)

Solutions

1. Read the wrapped Python exception message to find the real cause
2. Verify the method exists on the Python object and the arguments the template passes match its signature
3. Wrap risky Python methods in try/except and raise a clearer error for template authors

When it happens

Trigger: Thrown at packages/cubejs-backend-native/src/template/mj_value/python.rs:141 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of cube-js/cube@7d981676b3 (2026-09-02). Data as JSON: /api/errors/cc44db05bfb37a0b. Report an issue: GitHub.