Primero mi saludos a usted Sr. Fazt

requiero de ayuda en cuanto a la solución para poder eliminar objeto en firebase esto haciendo énfasis en su ejercicio.

Estos son los errores cuando intento eliminar el objeto.

vue.esm.js?efeb:628 [Vue warn]: Error in v-on handler: "Error: Reference.child failed: First argument was an invalid path = "undefined". Paths must be non-empty strings and can't contain ".", "#", "$", "[", or "]""

y

Error: Reference.child failed: First argument was an invalid path = "undefined". Paths must be non-empty strings and can't contain ".", "#", "$", "[", or "]"
at validatePathString (index.esm.js?66c8:1669)
at Reference.child (index.esm.js?66c8:13889)
at VueComponent.deleteWebsite (App.vue?26cd:108)
at click (eval at ./node_modules/vue-loader/lib/template-compiler/index.js?{"id":"data-v-7ba5bd90","hasScoped":false,"transformToRequire":{"video":["src","poster"],"source":"src","img":"src","image":"xlink:href"},"buble":{"transforms":{}}}!./node_modules/vue-loader/lib/selector.js?type=template&index=0!./src/App.vue

acá el código:

{{web.name}} {{web.author}} Delete <script> import Firebase from 'firebase'; import config from './config'; let app = Firebase.initializeApp(config); let db = app.database(); let websitesRef = db.ref('websites'); export default { name: 'App', firebase: { websites:websitesRef }, data() { return { websites:[], newWebsite: { name: '', author: '', url:'' } } }, created() { Firebase.database().ref('websites').on('value', (snapshot) => { this.websites = snapshot.val() }) }, methods:{ addWebsite(){ websitesRef.push(this.newWebsite); this.newWebsite.name=''; this.newWebsite.url=''; this.newWebsite.author=''; }, deleteWebsite(website){ websitesRef.child(website['.key']).remove() } } } </script>

Gracias