wasmerio/wasmer · error

payload length mismatch

Error message

payload length mismatch

What it means

Error "payload length mismatch" thrown in wasmerio/wasmer.

Source

Thrown at lib/api/src/backend/sys/entities/exception.rs:33

    exnref: wasmer_vm::VMExceptionRef,
}

impl Exception {
    /// Creates a new exception with the given tag and payload, and also creates
    /// a reference to it, returning the reference.
    #[allow(irrefutable_let_patterns)]
    pub fn new(store: &mut impl AsStoreMut, tag: &crate::sys::tag::Tag, payload: &[Value]) -> Self {
        if !tag.is_from_store(store) {
            panic!("cannot create Exception with Tag from another Store");
        }

        let store_objects = store.as_store_ref().objects().as_sys();
        let store_id = store_objects.id();

        let tag_ty = tag.handle.get(store_objects).signature.params();

        if tag_ty.len() != payload.len() {
            panic!("payload length mismatch");
        }

        let values = payload
            .iter()
            .enumerate()
            .map(|(i, v)| {
                if v.ty() != tag_ty[i] {
                    panic!("payload type mismatch");
                }
                v.as_raw(store)
            })
            .collect::<Vec<_>>()
            .into_boxed_slice();

        let ctx = store.objects_mut().as_sys_mut();
        let exception = wasmer_vm::VMExceptionObj::new(tag.handle.internal_handle(), values);
        let exn_handle = wasmer_vm::StoreHandle::new(ctx, exception);
        let exnref = wasmer_vm::VMExceptionRef(exn_handle);

View on GitHub (pinned to 8c4b9ee9d3)

When it happens

Trigger: Thrown at lib/api/src/backend/sys/entities/exception.rs:33 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of wasmerio/wasmer@8c4b9ee9d3 (2026-09-01). Data as JSON: /api/errors/87ad62db17efd813. Report an issue: GitHub.