Class problem/Error

[laza-niaina]

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    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">

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:animateLayoutChanges="true"
        android:fitsSystemWindows="true"
        android:layout_above="@+id/bottomNavigationView">

        <com.google.android.material.appbar.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:theme="@style/AppTheme.AppBarOverlay">

            <androidx.appcompat.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"/>

        </com.google.android.material.appbar.AppBarLayout>

        <FrameLayout
            android:id="@+id/fragment_container"
            android:layout_width="match_parent"   
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

    <com.gauravk.bubblenavigation.BubbleNavigationConstraintView
        android:id="@+id/top_navigation_constraint"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="380dp"
        android:background="#FFFFFDFB"
        android:elevation="4dp"
        android:padding="12dp"
        app:bnc_mode="spread">

        <com.gauravk.bubblenavigation.BubbleToggleView
            android:id="@+id/c_item_rest"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:bt_active="true"
            app:bt_colorActive="#FFFDE9DF"
            app:bt_colorInactive="#FFF7F7F7"
            app:bt_icon="@drawable/iconoir_home"
            app:bt_shape="@drawable/iconoir_home"
            app:bt_title=""
            app:bt_padding="8dp"
            app:bt_titlePadding="0dp" />

    </com.gauravk.bubblenavigation.BubbleNavigationConstraintView>
</RelativeLayout>

Error :

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.app/com.example.app.activities.MainActivity}: android.view.InflateException: Binary XML file line #37: Binary XML file line #37: Error inflating class com.gauravk.bubblenavigation.BubbleNavigationConstraintView
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2572)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2654)
    at android.app.ActivityThread.-wrap11(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1488)
    at android.os.Handler.dispatchMessage(Handler.java:111)
    at android.os.Looper.loop(Looper.java:207)
    at android.app.ActivityThread.main(ActivityThread.java:5728)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
Caused by: android.view.InflateException: Binary XML file line #37: Binary XML file line #37: Error inflating class com.gauravk.bubblenavigation.BubbleNavigationConstraintView
    at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
    at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)
    at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
    at com.example.app.activities.MainActivity.onCreate(MainActivity.java:23)
    at android.app.Activity.performCreate(Activity.java:6301)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2519)
    ... 9 more
Caused by: android.view.InflateException: Binary XML file line #37: Error inflating class com.gauravk.bubblenavigation.BubbleNavigationConstraintView
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:776)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
    at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
    ... 17 more
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.gauravk.bubblenavigation.BubbleNavigationConstraintView" on path: DexPathList[[zip file "/data/app/com.example.app-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example.app-1/lib/arm, /vendor/lib, /system/lib]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
    at android.view.LayoutInflater.createView(LayoutInflater.java:583)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:764)
    ... 21 more
    Suppressed: java.lang.NoClassDefFoundError: com.gauravk.bubblenavigation.BubbleNavigationConstraintView
        at dalvik.system.DexFile.defineClassNative(Native Method)
        at dalvik.system.DexFile.defineClass(DexFile.java:226)
        at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:219)
        at dalvik.system.DexPathList.findClass(DexPathList.java:338)
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:54)
        ... 25 more
    Suppressed: java.lang.ClassNotFoundException: com.gauravk.bubblenavigation.BubbleNavigationConstraintView
        at java.lang.Class.classForName(Native Method)
        at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
        at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
        ... 24 more
    Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

[Exsonjkm]

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