New vue.js warning in developer console

[upkarlidder]

Describe the bug I now get this vue warning in the browser console.

vue.runtime.esm.js?2b0e:619 [Vue warn]: Property or method "areLeftPanels" is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property. See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.

found in

---> <AppHeader> at src/components/AppHeader/AppHeader.vue
       <PageLayout> at src/components/PageLayout/PageLayout.vue
         <LandingPage> at src/views/LandingPage/LandingPage.vue
           <App> at src/App.vue
             <Root>

To Reproduce Steps to reproduce the behavior:

1. Go to 'http://localhost:3000/#/'
2. Open developer console to see the warning

Expected behavior The console show not contain this warning. The menu works fine in small pages in a responsive way.

Screenshots

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context Add any other context about the problem here.