Binary XML file line #10: Error inflating class yyy

[MDXDave]

Got the following error message when using the library:

10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: FATAL EXCEPTION: main
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: Process: com.xxx.yyy, PID: 7056
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xxx.yyy/com.xxx.yyy.stundenplan.StundenplanActivity}: android.view.InflateException: Binary XML file line #10: Error inflating class android.support.design.widget.CoordinatorLayout
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: at android.app.ActivityThread.access$800(ActivityThread.java:144)
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: at android.os.Looper.loop(Looper.java:135)
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5221)
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
10-02 16:06:39.879 7056-7056/com.xxx.yyy E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

or

10-02 16:07:58.948 8288-8288/com.xxx.yyy W/System.err: android.view.InflateException: Binary XML file line #9: Error inflating class
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.view.LayoutInflater.createView(LayoutInflater.java:633)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:743)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:255)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at com.xxx.yyy.settings.ShowSettingsActivity.onCreate(ShowSettingsActivity.java:57)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.app.Activity.performCreate(Activity.java:5933)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.app.ActivityThread.access$800(ActivityThread.java:144)
10-02 16:07:58.949 8288-8288/com.xxx.yyy W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
10-02 16:07:58.950 8288-8288/com.xxx.yyy W/System.err: at android.os.Handler.dispatchMessage(Handler.java:102)
10-02 16:07:58.950 8288-8288/com.xxx.yyy W/System.err: at android.os.Looper.loop(Looper.java:135)
10-02 16:07:58.950 8288-8288/com.xxx.yyy W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5221)
10-02 16:07:58.950 8288-8288/com.xxx.yyy W/System.err: at java.lang.reflect.Method.invoke(Native Method)
10-02 16:07:58.950 8288-8288/com.xxx.yyy W/System.err: at java.lang.reflect.Method.invoke(Method.java:372)
10-02 16:07:58.950 8288-8288/com.xxx.yyy W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
10-02 16:07:58.950 8288-8288/com.xxx.yyy W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

Any idea how to fix this problem?