Opening settings crashes the app

[CapnMarius]

FATAL EXCEPTION: main Process: com.tuyafeng.watt, PID: 15797 android.content.res.Resources$NotFoundException: Drawable com.tuyafeng.watt:drawable/ic_action_back with resource ID #0x7f07006d Caused by: android.content.res.Resources$NotFoundException: File res/drawable-anydpi-v21/ic_action_back.xml from drawable resource ID #0x7f07006d at android.content.res.ResourcesImpl.loadDrawableForCookie(ResourcesImpl.java:879) at android.content.res.ResourcesImpl.loadDrawable(ResourcesImpl.java:673) at android.content.res.Resources.loadDrawable(Resources.java:1002) at android.content.res.Resources.getDrawableForDensity(Resources.java:992) at android.content.res.Resources.getDrawable(Resources.java:931) at android.content.Context.getDrawable(Context.java:810) at g.h.c.a.b(SourceFile:2) at h.e.a.a.H(SourceFile:1) at com.tuyafeng.watt.preference.PreferenceWrapperFragment.f0(SourceFile:1) at g.l.b.g0.e(SourceFile:29) at g.l.b.g0.j(SourceFile:33) at g.l.b.a0.E(SourceFile:68) at g.l.b.a0.Y(SourceFile:11) at g.l.b.a0.C(SourceFile:14) at g.l.b.a0$g.run(SourceFile:1) at android.os.Handler.handleCallback(Handler.java:942) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loopOnce(Looper.java:201) at android.os.Looper.loop(Looper.java:288) at android.app.ActivityThread.main(ActivityThread.java:7959) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:942) Caused by: android.view.InflateException: Class not found x at android.graphics.drawable.DrawableInflater.inflateFromClass(DrawableInflater.java:219) at android.graphics.drawable.DrawableInflater.inflateFromXmlForDensity(DrawableInflater.java:138) at android.graphics.drawable.Drawable.createFromXmlInnerForDensity(Drawable.java:1394) at android.graphics.drawable.Drawable.createFromXmlForDensity(Drawable.java:1355) at android.content.res.ResourcesImpl.loadXmlDrawable(ResourcesImpl.java:911) at android.content.res.ResourcesImpl.loadDrawableForCookie(ResourcesImpl.java:865) ... 22 more Caused by: java.lang.ClassNotFoundException: Didn't find class "x" on path: DexPathList[[zip file "/data/app/~~z301OMAJMzAl5DJVMfqWgQ==/com.tuyafeng.watt-bjV1mdfv93FImS49BXOKkg==/base.apk"],nativeLibraryDirectories=[/data/app/~~z301OMAJMzAl5DJVMfqWgQ==/com.tuyafeng.watt-bjV1mdfv93FImS49BXOKkg==/lib/arm64, /system/lib64, /system_ext/lib64]] at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:259) at java.lang.ClassLoader.loadClass(ClassLoader.java:379) at java.lang.ClassLoader.loadClass(ClassLoader.java:312) at android.graphics.drawable.DrawableInflater.inflateFromClass(DrawableInflater.java:200) ... 27 more