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E/AndroidRuntime: FATAL EXCEPTION: main
                      Process: com.TEST.TEST, PID: 27236
                      android.view.InflateException: Binary XML file line #26: Binary XML file line #26: Error inflating class com.google.android.material.appbar.CollapsingToolbarLayout
                      Caused by: android.view.InflateException: Binary XML file line #26: Error inflating class com.google.android.material.appbar.CollapsingToolbarLayout
    enter code here
                      Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.material.appbar.CollapsingToolbarLayout" 
here is xml I use:
<?xml version="1.0" encoding="utf-8"?>
<ProgressBar
    android:id="@+id/progressTickets"
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:indeterminate="true" />
<android.support.design.widget.AppBarLayout
    android:id="@+id/app_bar_layout"
    android:layout_width="match_parent"
    android:layout_height="250dp"
    android:fitsSystemWindows="true"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
    <com.google.android.material.appbar.CollapsingToolbarLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:contentScrim="?attr/colorPrimary"
        app:expandedTitleGravity="top"
        app:expandedTitleMarginStart="10dp"
        app:expandedTitleMarginTop="10dp"
        app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
        <LinearLayout
            android:id="@+id/llBuyTickets"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/white"
            android:orientation="vertical">
            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="@font/montserrat_bold"
                android:text="@string/buy_ticket"
                android:textColor="@color/colorDarkGreen"
                android:textSize="9pt" />
            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:fontFamily="@font/roboto_regular"
                android:text="@string/buy_ticket_description"
                android:textColor="@color/colorDarkGreen" />
            <HorizontalScrollView
                android:id="@+id/svTicketTypes"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginBottom="@dimen/content_padding_medium"
                android:layout_marginTop="@dimen/content_padding_medium"
                android:scrollbars="none">
                <LinearLayout
                    android:id="@+id/llTicketTypes"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:gravity="center"
                    android:orientation="horizontal" />
            </HorizontalScrollView>
            <Button
                android:id="@+id/btnBuyTicket"
                style="@style/AlertDialog.AppCompat.Light"
                android:layout_width="match_parent"
                android:layout_height="@dimen/view_auth_item_size"
                android:background="@drawable/view_rounded_accent_bg"
                android:enabled="false"
                android:fontFamily="@font/montserrat_bold"
                android:text="@string/confirm_purchase"
                android:textColor="@color/white" />
        </LinearLayout>
        <android.support.v7.widget.Toolbar
            android:id="@+id/AppBar"
            android:layout_width="match_parent"
            android:layout_height="10dp"
            app:layout_collapseMode="pin" />
    </com.google.android.material.appbar.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:fontFamily="@font/montserrat_bold"
    android:text="@string/my_ticket"
    android:textColor="@color/colorDarkGreen"
    android:textSize="9pt" />
<android.support.v7.widget.RecyclerView
    android:id="@+id/rvTickets"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:support-v4:27.1.1'
implementation 'com.android.support:design:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
                may be because same above code is working fine for me with same dependencies and with minSdkVersion 19
– AskNilesh
                Aug 20, 2018 at 12:34
                use android.support.design instead of android.support.design.widget         <android.support.design.widget.CollapsingToolbarLayout             android:id="@+id/collapsing_toolbar"             android:layout_width="match_parent"             android:layout_height="match_parent"             app:layout_scrollFlags="scroll|exitUntilCollapsed"             app:contentScrim="?attr/colorPrimary">
– Rahul Chokshi
                Aug 20, 2018 at 12:38
Use android.support.design instead of android.support.design.widget

<android.support.design.widget.CollapsingToolbarLayout 
   android:id="@+id/collapsing_toolbar" 
   android:layout_width="match_parent" 
   android:layout_height="match_parent" 
   app:layout_scrollFlags="scroll|exitUntilCollapsed" 
   app:contentScrim="?attr/colorPrimary"/> 
        
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