Can not remove device admin from PhoneCheckDPC

I entered adb shell dpm remove-active-admin com.afwsamples.testdpc/.DeviceAdminReceiver
I got:

java.lang.SecurityException: Attempt to remove non-test admin ComponentInfo{com.afwsamples.testdpc/com.afwsamples.testdpc.DeviceAdminReceiver} 0
at android.os.Parcel.createException(Parcel.java:2088)
at android.os.Parcel.readException(Parcel.java:2056)
at android.os.Parcel.readException(Parcel.java:2004)
at android.app.admin.IDevicePolicyManager$Stub$Proxy.forceRemoveActiveAdmin(IDevicePolicyManager.java:9204)
at com.android.commands.dpm.Dpm.runRemoveActiveAdmin(Dpm.java:222)
at com.android.commands.dpm.Dpm.onRun(Dpm.java:121)
at com.android.internal.os.BaseCommand.run(BaseCommand.java:56)
at com.android.commands.dpm.Dpm.main(Dpm.java:41)
at com.android.internal.os.RuntimeInit.nativeFinishInit(Native Method)
at com.android.internal.os.RuntimeInit.main(RuntimeInit.java:342)
Caused by: android.os.RemoteException: Remote stack trace:
at com.android.server.devicepolicy.DevicePolicyManagerService.forceRemoveActiveAdmin(DevicePolicyManagerService.java:4619)
at android.app.admin.IDevicePolicyManager$Stub.onTransact(IDevicePolicyManager.java:3955)
at android.os.Binder.execTransactInternal(Binder.java:1056)
at android.os.Binder.execTransact(Binder.java:1029)

I just want to uninstall Phone Check DPC and DPC Test App