NbMenuItem problem about nebular

[YukiDmZhao]

ERROR TypeError: Cannot read property 'push' of undefined
at NbMenuComponent.webpackJsonp.../../../../@nebular/theme/components/menu/menu.component.js.NbMenuComponent.ngOnInit (menu.component.js:172)
at checkAndUpdateDirectiveInline (core.es5.js:10856)
at checkAndUpdateNodeInline (core.es5.js:12357)

[YukiDmZhao]

menu,json
[
{
"title": "Dashboard",
"icon": "nb-home",
"link": "/pages/dashboard",
"home": true
},
{
"title": "FEATURES",
"group": true
},
{
"title": "UI Features",
"icon": "nb-keypad",
"link": "/pages/ui-features",
"children": [
{
"title": "Buttons",
"link": "/pages/ui-features/buttons"
},
{
"title": "Grid",
"link": "/pages/ui-features/grid"
},
{
"title": "Icons",
"link": "/pages/ui-features/icons"
},
{
"title": "Modals",
"link": "/pages/ui-features/modals"
}
]
},
{
"title": "Forms",
"icon": "nb-compose",
"children": [
{
"title": "Form Inputs",
"link": "/pages/forms/inputs"
},
{
"title": "Form Layouts",
"link": "/pages/forms/layouts"
}
]
}
]

this.httpService.get('assets/mocks/menu.json').then(result => {
this.menu =result;
});

error:
ERROR TypeError: Cannot read property 'push' of undefined
at NbMenuComponent.webpackJsonp.../../../../@nebular/theme/components/menu/menu.component.js.NbMenuComponent.ngOnInit (vendor.bundle.js:3555)
at checkAndUpdateDirectiveInline (vendor.bundle.js:81767)
at checkAndUpdateNodeInline (vendor.bundle.js:83268)
at checkAndUpdateNode (vendor.bundle.js:83207)
at debugCheckAndUpdateNode (vendor.bundle.js:84071)
at debugCheckDirectivesFn (vendor.bundle.js:84012)
at Object.eval [as updateDirectives] (ng:///PagesModule/PagesComponent.ngfactory.js:23)
at Object.debugUpdateDirectives [as updateDirectives] (vendor.bundle.js:83997)
at checkAndUpdateView (vendor.bundle.js:83174)
at callViewAction (vendor.bundle.js:83542)
View_PagesComponent_0 @ ng:///PagesModule/PagesComponent.ngfactory.js:12
11:17:05.066

[YukiDmZhao]

menu;
menu0: NbMenuItem[] = [];

if use menu0: can not get menu, and error so up.
if use menu: can get menu, and error so up.

[nnixaa]

@YukiDmZhao please post more or less complete reproducible example with a concrete example of the issue with Nebular, as this looks like an issue with your code, and pretty hard to understand what you are trying to achieve. Thanks.