android.support.design.widget.AppBarLayout cannot be cast to android.view.ViewGroup.

Hello everyone,I am a Android beginner.When I run my project I have trouble in the Android Studio.And when the project is rendering, here are the notes:Rendering Problems Exception raised during rendering: android.support.design.widget.AppBarLayout cannot be cast to android.view.ViewGroup .And I check some information I don't find any answer.
And here are my activity_main.xml

Code:

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<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="/apk/res/android"
    xmlns:app="/apk/res-auto"
    xmlns:tools="/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.example.iqiqi.myapplication.MainActivity">

      <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

---

Here are the style.xml.

Code:

---

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <style name="AppTheme.NoActionBar">
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
    </style>

    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />

    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />

</resources>

---

Here are the details.

Code:

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java.lang.ClassCastException: android.support.design.widget.AppBarLayout cannot be cast to android.view.ViewGroup
        at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:836)
        at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:811)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
        at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:838)
        at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:811)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
        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:223)
        at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:426)
        at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:350)
        at com.android.tools.idea.rendering.RenderTask.compute(RenderTask.java:510)
        at com.android.tools.idea.rendering.RenderTask.compute(RenderTask.java:498)
        at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:888)
        at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:498)
        at com.android.tools.idea.rendering.RenderTask.access0(RenderTask.java:72)
        at com.android.tools.idea.rendering.RenderTask.call(RenderTask.java:610)
        at com.android.tools.idea.rendering.RenderTask.call(RenderTask.java:607)
        at com.android.tools.idea.rendering.RenderService.runRenderAction(RenderService.java:362)
        at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:607)
        at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:629)
        at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.doRender(AndroidLayoutPreviewToolWindowManager.java:652)
        at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.access00(AndroidLayoutPreviewToolWindowManager.java:80)
        at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.run(AndroidLayoutPreviewToolWindowManager.java:594)
        at com.intellij.openapi.progress.impl.CoreProgressManager.run(CoreProgressManager.java:152)
        at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:452)
        at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:402)
        at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
        at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:137)
        at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.run(AndroidLayoutPreviewToolWindowManager.java:589)
        at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)
        at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)
        at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:254)
        at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)
        at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)
        at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)
        at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
        at com.intellij.util.Alarm$Request.run(Alarm.java:351)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)

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And I don't know how to solve this,please tell me,thanks...

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