wasmerio/wasmer · error

No backend available

Error message

No backend available

What it means

Error "No backend available" thrown in wasmerio/wasmer.

Source

Thrown at lib/api/src/entities/function/host/imp.rs:59

            #[cfg(feature = "sys")]
            fn function_callback_sys(&self) -> crate::vm::VMFunctionCallback {
                paste::paste! {
                    crate::vm::VMFunctionCallback::Sys(crate::backend::sys::function::[<gen_fn_callback_ $c_struct_name:lower >](self))
                }
            }

            #[allow(non_snake_case)]
            fn call_trampoline_address() -> crate::vm::VMTrampoline {
                paste::paste! {
                    #[cfg(feature = "sys")]
                    {
                        crate::vm::VMTrampoline::Sys(crate::backend::sys::function::[<gen_call_trampoline_address_ $c_struct_name:lower >]::<$($x,)* Rets>())
                    }

                    #[cfg(not(feature = "sys"))]
                    {
                        unimplemented!("No backend available")
                    }
                }
            }
        }

        // Implement `HostFunction` for a function that has the same arity than the tuple.
        #[allow(unused_parens)]
        impl< $( $x, )* Rets, RetsAsResult, Func >
            crate::HostFunction<(), ( $( $x ),* ), Rets, WithoutEnv>
        for
            Func
        where
            $( $x: FromToNativeWasmType, )*
            Rets: WasmTypeList,
            RetsAsResult: IntoResult<Rets>,
            Func: Fn($( $x , )*) -> RetsAsResult + 'static
        {
            #[allow(non_snake_case)]

View on GitHub (pinned to 8c4b9ee9d3)

When it happens

Trigger: Thrown at lib/api/src/entities/function/host/imp.rs:59 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/22ca7159b5d89d70. Report an issue: GitHub.