[HTC U11  ROMs, Kernels, Recoveries, & Other Develo] j to the 4n:
how did you add that internet calling setting?

You added it yourself? Obviously you used the android preference classes instead of the htc ones.

07-24 22:37:48.782 3500 3500 E AndroidRuntime: Process: com.android.phone, PID: 3500
07-24 22:37:48.782 3500 3500 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.phone/com.android.phone.sip.SipSettings}: java.lang.ClassCastException: android.preference.PreferenceCategory cannot be cast to com.htc.lib1.cc.widget.preference.HtcPreferenceCategory
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java)
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java)
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at android.app.ActivityThread.-wrap12(ActivityThread.java)
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at android.app.ActivityThread$H.handleMessage(ActivityThread.java)
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at android.os.Handler.dispatchMessage(Handler.java)
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at android.os.Looper.loop(Looper.java)
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at android.app.ActivityThread.main(ActivityThread.java)
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at java.lang.reflect.Method.invoke(Native Method)
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
07-24 22:37:48.782 3500 3500 E AndroidRuntime: Caused by: java.lang.ClassCastException: android.preference.PreferenceCategory cannot be cast to com.htc.lib1.cc.widget.preference.HtcPreferenceCategory
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at com.android.phone.sip.SipSettings.onCreate(SipSettings.java:162)
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at android.app.Activity.performCreate(Activity.java)
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java)
07-24 22:37:48.782 3500 3500 E AndroidRuntime:	... 10 more
07-24 22:38:10.850 13817 14546 I System : exec(su -c logcat | grep AndroidRuntime @ com.m0narx.tweaks.process.LogcatWriter.run)
07-24 22:38:17.967 13208 13208 E AndroidRuntime: FATAL EXCEPTION: main
07-24 22:38:17.967 13208 13208 E AndroidRuntime: Process: com.android.phone, PID: 13208
07-24 22:38:17.967 13208 13208 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.phone/com.android.phone.sip.SipSettings}: java.lang.ClassCastException: android.preference.PreferenceCategory cannot be cast to com.htc.lib1.cc.widget.preference.HtcPreferenceCategory
07-24 22:38:17.967 13208 13208 E AndroidRuntime:	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java)
07-24 22:38:17.967 13208 13208 E AndroidRuntime:	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java)
07-24 22:38:17.967 13208 13208 E AndroidRuntime:	at android.app.ActivityThread.-wrap12(ActivityThread.java)
07-24 22:38:17.967 13208 13208 E AndroidRuntime:	at android.app.ActivityThread$H.handleMessage(ActivityThread.java)
07-24 22:38:17.967 13208 13208 E AndroidRuntime:	at android.os.Handler.dispatchMessage(Handler.java)
07-24 22:38:17.967 13208 13208 E AndroidRuntime:	at android.os.Looper.loop(Looper.java)
07-24 22:38:17.967 13208 13208 E AndroidRuntime:	at android.app.ActivityThread.main(ActivityThread.java)
07-24 22:38:17.967 13208 13208 E AndroidRuntime:	at java.lang.reflect.Method.invoke(Native Method)
07-24 22:38:17.967 13208 13208 E AndroidRuntime:	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
07-24 22:38:17.967 13208 13208 E AndroidRuntime:	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
07-24 22:38:17.967 13208 13208 E AndroidRuntime: Caused by: java.lang.ClassCastException: android.preference.PreferenceCategory cannot be cast to com.htc.lib1.cc.widget.preference.HtcPreferenceCategory