Xamarin Android custom action bar - something went wrong error

Question

I was trying to do exactly this tutorial for xamarin android: https://docs.microsoft.com/pl-pl/xamarin/android/user-interface/controls/tool-bar/replacing-the-action-bar okay so for the first time my project went good and I even created my custom bar but then I couldn't see the edit, save, overflow icons on the right of the menu, so I wanted to create the project again. Now my problem is that I get the error Something went wrong in the designer - Click on photo to see the error when I add this code:

<include
    android:id="@+id/toolbar"
    layout="@layout/toolbar" />

Can somebody help me, when I was doing project before it was working, now it is not and anyway I even got millions of errors when I try to do the project in other discs then C, why xamarin is bugged so much? I just need to create this app for studies..

DETAILS OF ERROR: Indirect rendering enabled Shadow-copying of Java assets took 97,194700 ms Setting id 1 on newly created ClassLoader

Trying to load class android.support.v7.widget.ActionBarOverlayLayout Trying to load class android.support.v7.widget.ContentFrameLayout Trying to load class android.support.v7.widget.ActionBarContainer Trying to load class android.support.v7.widget.Toolbar Trying to load class android.support.v7.widget.ActionBarContextView Trying to load class android.support.v7.app.WindowDecorActionBar Bridge [resources.resolve] Couldn't resolve resource @layout/toolbar Failed to process message Load mono.android.DesignerException: android.content.res.Resources$NotFoundException at mono.android.DesignerException.fromThrowable(DesignerException.java:31) at mono.android.DesignerSession.checkRenderResultForError(DesignerSession.java:217) at mono.android.DesignerSession.load(DesignerSession.java:283) at mono.android.DesignerSession.processMessage(DesignerSession.java:656) at mono.android.MessageListener.executeMessage(MessageListener.java:88) at mono.android.MessageListener$Runner.run(MessageListener.java:44) at java.lang.Thread.run(Thread.java:748) Caused by: android.content.res.Resources$NotFoundException: Could not find string resource matching value 0x3F1 (resolved name: layoutlib) in current configuration. Or the resolved value was not of type layout as expected. at android.content.res.Resources_Delegate.throwException(Resources_Delegate.java:1145) at android.content.res.Resources_Delegate.throwException(Resources_Delegate.java:1121) at android.content.res.Resources_Delegate.getLayout(Resources_Delegate.java:497) at android.content.res.Resources.getLayout(Resources.java:1155) at android.view.LayoutInflater_Delegate.parseInclude(LayoutInflater_Delegate.java:140) at android.view.LayoutInflater.parseInclude(LayoutInflater.java:900) at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:859) at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:72) at android.view.LayoutInflater.rInflate(LayoutInflater.java:837) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824) at android.view.LayoutInflater.inflate(LayoutInflater.java:515) at android.view.LayoutInflater.inflate(LayoutInflater.java:394) at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:323) at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:394) at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:271) at mono.android.DesignerSession.load(DesignerSession.java:270) ... 4 more

Answer 1

Rename "toolbar.xml" e.g to "app_toolbar.xml"