submenus

[erikbullens]

Hi,
I want to create submenus in the left menu.
I changed the navigation like:
export const navigation = [
{
text: 'Home',
path: '/home',
icon: 'home'
},
{
text: 'Facilities',
icon: 'folder',
items: [
{
text: 'Profile',
icon : 'folder',
items :
[
{
text : 'test',
path: '/fire-permit-overview'
}
]
},
{
text: 'Fire Permits',
path: '/fire-permit-overview'
}
]
}
];
but I got the error : ERROR TypeError: Cannot read property 'getNodeByKey' of undefined
Is it possible?