I’m using @wire to get the getMenuStructure  from es_get_Menu_Items,
When I call es_get_Menu_Items. getMenuStructure(  'a0u0C000009cXeIQAU')
from a debug window it returns a list
When I call it from an aura component I get data,
its the wire that’s not working, rather than the apex code
when I run the below it returns undefined.
Can you see what I am doing wrong ?

/*JS*/
import { LightningElement, api, wire, track } from 'lwc';
import getMenuStructure from '@salesforce/apex/es_get_Menu_Items.getMenuStructure';

export default class ChildComponent extends LightningElement {
    @api authStatuses;
    @api error;

    @wire(getMenuStructure  , {questionsetUserId: 'a0u0C000009cXeIQAU'})

    getMenuStructure({data,error}){
        alert('success ' + data);  
        if (data) {
            this.menuStructure = data;
            this.error = undefined;

        } else if (error) {
            this.error = error;
            this.menuStructure= undefined;
        }
    };        
}