title: CollapsingToolBarLayout could not be instantiated
body: <p>For the past few months I have been using Collapsing Toolbar Layout with no problem. However today, this error pops up whenever I open the xml file. The exact error reads: </p>
  
  <p>The following classes could not be instantiated:
  - android.support.design.widget.CollapsingToolbarLayout</p>
  
  <p>Here is the stack trace:</p>
  
  <pre><code>  android.content.res.Resources$NotFoundException
      at com.android.layoutlib.bridge.android.BridgeContext.obtainStyledAttributes(BridgeContext.java:656)
      at com.android.layoutlib.bridge.android.BridgeContext.obtainStyledAttributes(BridgeContext.java:111)
      at android.support.v7.widget.TintTypedArray.obtainStyledAttributes(TintTypedArray.java:55)
      at android.support.design.widget.CollapsingTextHelper.setCollapsedTextAppearance(CollapsingTextHelper.java:202)
      at android.support.design.widget.CollapsingToolbarLayout.&lt;init&gt;(CollapsingToolbarLayout.java:199)
      at android.support.design.widget.CollapsingToolbarLayout.&lt;init&gt;(CollapsingToolbarLayout.java:140)
      at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
      at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
      at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
      at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
      at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:465)
      at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:172)
      at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:105)
      at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadView(LayoutlibCallbackImpl.java:186)
      at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:334)
      at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:345)
      at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:245)
      at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
      at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:858)
      at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)
      at android.view.LayoutInflater.rInflate(LayoutInflater.java:834)
      at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
      at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:861)
      at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)
      at android.view.LayoutInflater.rInflate(LayoutInflater.java:834)
      at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
      at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
      at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
      at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:324)
      at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:429)
      at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:389)
      at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:548)
      at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:533)
      at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:966)
      at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:533)
      at com.android.tools.idea.rendering.RenderTask.lambda$inflate$72(RenderTask.java:659)
      at java.util.concurrent.FutureTask.run(FutureTask.java:266)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      at java.lang.Thread.run(Thread.java:745)
  </code></pre>
  
  <p><strong>CollapsingToolBarLayout.xml</strong></p>
  
  <pre><code> &lt;android.support.design.widget.CoordinatorLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:background="@color/colorPrimary"&gt;
     &lt;android.support.design.widget.AppBarLayout
        android:id="@+id/custom_view1"
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:background="#FFFFFF"
        &gt;
  
      &lt;android.support.design.widget.CollapsingToolbarLayout
          android:id="@+id/collapsing_toolbar"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          app:collapsedTitleTextAppearance="@color/black"
          app:contentScrim="@color/colorPrimary"
          app:layout_scrollFlags="scroll|exitUntilCollapsed"
          &gt;
        &lt;RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:clickable="true"
            &gt;
          &lt;ImageView
              android:id="@+id/backdrop"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:baselineAlignBottom="false"
              android:fitsSystemWindows="true"
              android:scaleType="centerCrop"
              app:layout_collapseMode="parallax"
              /&gt;
          &lt;ImageView
              android:id="@+id/play_btn"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:adjustViewBounds="true"
              android:baselineAlignBottom="false"
              android:clickable="true"
              android:scaleType="center"
              app:srcCompat="@drawable/play_button"
              /&gt;
        &lt;/RelativeLayout&gt;
        &lt;android.support.v7.widget.Toolbar
            android:id="@+id/my_toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_collapseMode="pin"
  
  
            /&gt;
  
      &lt;/android.support.design.widget.CollapsingToolbarLayout&gt;
    &lt;/android.support.design.widget.AppBarLayout&gt;
  </code></pre>
  
  <p>Upon running the app in the emulator, the toolbar works just fine, but I'm still confused why this is happening in android studio. I've cleared caches, rebuilt, rechecked Support Library Versions, and everything else I could think of. What am I missing?</p>