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New To App Development Problems

I have just recently started to work with kotlin and am working on developing an app, however I am having difficulty due to what I believe is lack of familiarity with the language. So any help would be appreciated.

Problem 1 (main): I am trying to implement a navigation drawer on top of a navigation bar to sub-divide some of the options.
example: Nav Bar (3 options) -> Nav drawer 1 ( 6 options ), Nav drawer 2 ( 6 options ), Nav drawer 3 ( 6 options ).
The problem is that I can't get my "onNavigationItemSelected" function to recognize the Nav Drawer buttons.

Problem 2 (other): I am getting a app crash when I try to implement a menu button to activate the nav drawer, receiving a "findViewById(R.id.drawer_layout) must not be null" error. I have the exact same code in another project and it works fine, I can't figure out what in this code is braking it.

Problem 3 (annoyance): Everything is fine when I start the application up but when I select an option from the nav bar the toolbar at the top of the screen slides up. May be linked to problem number 2.

Github for the Project: github.com/W-y-e/ShiftRing
 
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