Error inflating class ParallaxImageView

[Alnour]

I add the repository as follows
repositories{ jcenter() flatDir{ dirs 'libs' } }
and then changed my ImageView as follows:
<ParallaxImageView android:id="@+id/background_image" android:layout_width="fill_parent" android:layout_height="fill_parent" android:src="@drawable/bird" android:scaleType="centerCrop" />
but I got this exception
Process: com.foxtrapp.mysmallcommunity, PID: 25153 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.foxtrapp.mysmallcommunity/com.foxtrapp.mysmallcommunity.ui.activities.RegisterByEmailActivity}: android.view.InflateException: Binary XML file line #6: Error inflating class ParallaxImageView at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2339) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413) at android.app.ActivityThread.access$800(ActivityThread.java:155) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5343) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700) Caused by: android.view.InflateException: Binary XML file line #6: Error inflating class ParallaxImageView at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:757) at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) at android.view.LayoutInflater.inflate(LayoutInflater.java:504) at android.view.LayoutInflater.inflate(LayoutInflater.java:414) at android.view.LayoutInflater.inflate(LayoutInflater.java:365) at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:257) at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109) at com.foxtrapp.mysmallcommunity.ui.activities.RegisterByEmailActivity.onCreate(RegisterByEmailActivity.java:73) at android.app.Activity.performCreate(Activity.java:6010) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413)  at android.app.ActivityThread.access$800(ActivityThread.java:155)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:135)  at android.app.ActivityThread.main(ActivityThread.java:5343)  at java.lang.reflect.Method.invoke(Native Method)  at java.lang.reflect.Method.invoke(Method.java:372)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)  Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.ParallaxImageView" on path: DexPathList[[zip file "/data/app/com.foxtrapp.mysmallcommunity-2/base.apk"],nativeLibraryDirectories=[/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:571) at android.view.LayoutInflater.onCreateView(LayoutInflater.java:665) at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:65) at android.view.LayoutInflater.onCreateView(LayoutInflater.java:682) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:741) at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)  at android.view.LayoutInflater.inflate(LayoutInflater.java:504)  at android.view.LayoutInflater.inflate(LayoutInflater.java:414)  at android.view.LayoutInflater.inflate(LayoutInflater.java:365)  at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:257)  at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)  at com.foxtrapp.mysmallcommunity.ui.activities.RegisterByEmailActivity.onCreate(RegisterByEmailActivity.java:73)  at android.app.Activity.performCreate(Activity.java:6010)  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292)  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413)  at android.app.ActivityThread.access$800(ActivityThread.java:155)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:135)  at android.app.ActivityThread.main(ActivityThread.java:5343)  at java.lang.reflect.Method.invoke(Native Method)  at java.lang.reflect.Method.invoke(Method.java:372)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)