Missing or insufficient permissions. at new FirestoreError

while working on Ionic 3 after execute logout() using firebase I’m getting the follwing error after the redirection to login-page:

Error: Missing or insufficient permissions.
    at new FirestoreError (error.js:140)
    at JsonProtoSerializer.fromRpcStatus (serializer.js:93)
    at JsonProtoSerializer.fromWatchChange (serializer.js:573)
    at PersistentListenStream.onMessage (persistent_stream.js:393)
    at persistent_stream.js:337
    at PersistentListenStream.<anonymous> (persistent_stream.js:313)
    at step (tslib.es6.js:97)
    at Object.next (tslib.es6.js:78)
    at tslib.es6.js:71
    at new t (polyfills.js:3)

The auth-provider’s logout function execute the following code:

 logout(): Promise<any> {
    // TODO: Read from storage if user loggedIn via FB before the call.
    return new Promise((resolve, reject) => {
      this.angularFireAuth.auth.signOut().then(() => {
      }).catch(() => {

and the caller funtion within the component execute the following code:

private logout(): void {
    this.auth.logout().then(() => {

Immediately after the login-page displays, I get the error.

Any help?