Substratum crash stacktrace

Build version: nine hundred ninety five
Device: SM-G930F (herolte) [samsung/heroltexx/herolte:7.0/NRD90M/G930FXXS1DQF6:user/release-keys]
ROM: 7.0 - Unknown
Theme system: RRO (Samsung)

Stack trace:
java.lang.RuntimeException: Unable to start activity ComponentInfo{projekt.substratum/projekt.substratum.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2924)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2985)
	at android.app.ActivityThread.-wrap14(ActivityThread.java)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1635)
	at android.os.Handler.dispatchMessage(Handler.java:102)
	at android.os.Looper.loop(Looper.java:154)
	at android.app.ActivityThread.main(ActivityThread.java:6692)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
	at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:354)
	at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:323)
	at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284)
	at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
	at android.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:303)
	at android.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:284)
	at projekt.substratum.MainActivity.onCreate(MainActivity.java:263)
	at android.app.Activity.performCreate(Activity.java:6912)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1126)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2877)
	... 9 more


User actions:
2018-07-23 10:08:27: LauncherActivity created
2018-07-23 10:08:27: SplashScreenActivity created
2018-07-23 10:08:27: SplashScreenActivity resumed
2018-07-23 10:08:28: LauncherActivity destroyed
2018-07-23 10:08:28: SplashScreenActivity paused
2018-07-23 10:08:30: SplashScreenActivity resumed
2018-07-23 10:08:30: SplashScreenActivity paused
2018-07-23 10:08:30: MainActivity created