运行时错误[Android Studio] Linphone项目

Question

我成功构建了项目但是当我在模拟器上运行项目时，我在屏幕上显示此错误。

Unfortunately Linphone has stop working!

虽然logcat显示运行时错误

FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to start activity ComponentInfo
{org.linphone/org.linphone.LinphoneActivity}: 
android.view.InflateException: Binary XML file line #60:
 Error inflating class org.linphone.ui.Numpad at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)

请帮我解决这个问题。我将完全欣赏！