java.lang.ClassNotFoundException: com.google.android.finsky.utils.SelfUpdateScheduler

[android-qtfy]

I install xinstall module, make debuggable , but it cannot work.

Here is the log :
10-16 17:23:52.368 5440-5440/? E/Xposed: de.robv.android.xposed.XposedHelpers$ClassNotFoundError: java.lang.ClassNotFoundException: com.google.android.finsky.utils.SelfUpdateScheduler
at de.robv.android.xposed.XposedHelpers.findClass(XposedHelpers.java:71)
at de.robv.android.xposed.XposedHelpers.findAndHookMethod(XposedHelpers.java:260)
at com.pyler.xinstaller.XInstaller.handleLoadPackage(XInstaller.java:1480)
at de.robv.android.xposed.IXposedHookLoadPackage$Wrapper.handleLoadPackage(IXposedHookLoadPackage.java:34)
at de.robv.android.xposed.callbacks.XC_LoadPackage.call(XC_LoadPackage.java:61)
at de.robv.android.xposed.callbacks.XCallback.callAll(XCallback.java:106)
at de.robv.android.xposed.XposedInit$2.beforeHookedMethod(XposedInit.java:134)
at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:340)
at android.app.ActivityThread.handleBindApplication()
at android.app.ActivityThread.-wrap1(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:107)
Caused by: java.lang.ClassNotFoundException: com.google.android.finsky.utils.SelfUpdateScheduler