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If you're plopping this into an existing project, you probably don't want to take the screens with it! Or make sure you just have one copy of the screens. While the error message doesn't specify, I imagine you might be running into an issue where the game_menu screen included with this project doesn't have some of the arguments that the game_menu screen in a default Ren'Py template has. 

That actually helped me fix the issue! While it was not directly an issue of me having two game_menu screens, looking over my game_menu screen made me find the root issue.
My game_menu screen was set up like this:

screen game_menu(title="", scroll=viewport, yinitial=0.0)

 
and that's where the game was asking me to capitalize the viewport, so I did:

screen game_menu(title="", scroll=Viewport, yinitial=0.0)


and that fixed it. That was just the pointer I needed.
---------------------------------------------------------------------------------------------------
Now for my second problem: When trying to open the help menu window specifically using a controller, I am getting this error:

I'm sorry, but an uncaught exception occurred.
While running game code:
  File "renpy/display/render.pyx", line 494, in renpy.display.render.render_screen
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 320, in renpy.display.render.render_for_size
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "game/01_high priority/01_controller_cdsl.rpy", line 808, in render
    self.reset_child()
    ~~~~~~~~~~~~~~~~^^
  File "game/01_high priority/01_controller_cdsl.rpy", line 791, in reset_child
    self.set_saved_icon()
    ~~~~~~~~~~~~~~~~~~~^^
  File "game/01_high priority/01_controller_cdsl.rpy", line 798, in set_saved_icon
    self.saved_icon = self.get_icon(self.suffix, self.icon_only)
                      ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "game/01_high priority/01_controller_cdsl.rpy", line 822, in get_icon
    event = pad_config.get_event(self.pad_event)
            ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "game/backend/controller_support/controller_functions.rpy", line 121, in get_event
    events = persistent.pad_bindings[event]
             ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^
KeyError: None
-- Full Traceback ------------------------------------------------------------
Traceback (most recent call last):
  File "renpy/common/_layout/screen_main_menu.rpym", line 28, in script
    python hide:
  File "renpy/ast.py", line 1187, in execute
    renpy.python.py_exec_bytecode(self.code.bytecode, self.hide, store=self.store)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/python.py", line 1273, in py_exec_bytecode
    exec(bytecode, globals, locals)
    ~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/common/_layout/screen_main_menu.rpym", line 28, in <module>
    python hide:
  File "renpy/common/_layout/screen_main_menu.rpym", line 35, in _execute_python_hide
    ui.interact()
    ~~~~~~~~~~~^^
  File "renpy/ui.py", line 306, in interact
    rv = renpy.game.interface.interact(roll_forward=roll_forward, **kwargs)
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/core.py", line 2154, in interact
    repeat, rv = self.interact_core(
                 ~~~~~~~~~~~~~~~~~~^
        preloads=preloads,
        ^^^^^^^^^^^^^^^^^^
    ...<4 lines>...
        **kwargs,
        ^^^^^^^^^
    )
    ^
  File "renpy/display/core.py", line 2833, in interact_core
    self.draw_screen(root_widget, fullscreen_video, (not fullscreen_video) or video_frame_drawn)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/core.py", line 1279, in draw_screen
    surftree = renpy.display.render.render_screen(
               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        root_widget,
        ^^^^^^^^^^^^
        renpy.config.screen_width,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
        renpy.config.screen_height,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "renpy/display/render.pyx", line 494, in renpy.display.render.render_screen
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/layout.py", line 896, in render
    surf = render(child, width, height, cst, cat)
           ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/transition.py", line 375, in render
    top = render(self.new_widget, width, height, st, at)
          ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/layout.py", line 896, in render
    surf = render(child, width, height, cst, cat)
           ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/layout.py", line 896, in render
    surf = render(child, width, height, cst, cat)
           ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/screen.py", line 767, in render
    child = renpy.display.render.render(self.child, w, h, st, at)
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/layout.py", line 896, in render
    surf = render(child, width, height, cst, cat)
           ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/layout.py", line 1444, in render
    surf = render(child, width - cxmargin - cxpadding, height - cymargin - cypadding, st, at)
           ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/layout.py", line 1104, in render
    surf = render(d, rw, height - y, cst, cat)
           ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/layout.py", line 1444, in render
    surf = render(child, width - cxmargin - cxpadding, height - cymargin - cypadding, st, at)
           ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/layout.py", line 1955, in render
    cwidth, cheight = sizeit("c", width, height, 0, 0)
                      ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/layout.py", line 1952, in sizeit
    rend = renpy.display.render.render_for_size(pos_d[pos], width, height, st, at)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 320, in renpy.display.render.render_for_size
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/viewport.py", line 283, in render
    surf = renpy.display.render.render(self.child, child_width, child_height, st, at)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/layout.py", line 1159, in render
    surf = render(d, width - x, rh, cst, cat)
           ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/layout.py", line 1159, in render
    surf = render(d, width - x, rh, cst, cat)
           ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "renpy/display/layout.py", line 1104, in render
    surf = render(d, rw, height - y, cst, cat)
           ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "renpy/display/render.pyx", line 170, in renpy.display.render.render
  File "renpy/display/render.pyx", line 267, in renpy.display.render.render
  File "game/01_high priority/01_controller_cdsl.rpy", line 808, in render
    self.reset_child()
    ~~~~~~~~~~~~~~~~^^
  File "game/01_high priority/01_controller_cdsl.rpy", line 791, in reset_child
    self.set_saved_icon()
    ~~~~~~~~~~~~~~~~~~~^^
  File "game/01_high priority/01_controller_cdsl.rpy", line 798, in set_saved_icon
    self.saved_icon = self.get_icon(self.suffix, self.icon_only)
                      ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "game/01_high priority/01_controller_cdsl.rpy", line 822, in get_icon
    event = pad_config.get_event(self.pad_event)
            ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "game/backend/controller_support/controller_functions.rpy", line 121, in get_event
    events = persistent.pad_bindings[event]
             ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^
KeyError: None
 
This error notably does not appear when navigating to the help screen using mouse or keyboard, using these methods shows the help window just fine, it only throws this error when using a controller to try and open the help window. I should also note that I have the keybind images from the controller_ui folder visually displayed on the help screen, in case that might be relevant.

Ah it should be `scroll="viewport"` as a string. The fact that it doesn't complain about Viewport is just 'cause you're setting it to the name of a class, which does exist, but isn't what the screen is expecting.

Have you updated ICON_FOLDER = "backend/controller_support/controller_ui/" at the top of controller_config.rpy to point to where you have the controller icons? It looks like you've put the files into your own subfolder, so you'll need to update the path where it can find the icons as well.

The icons are actually still in the backend folder. I made a separate folder for a few certain files in your pack to be higher up in the sorting order as they seemed to be conflicting when further down in the backend folder, since I have several order numbered folders in my game folder.


These are the files I have moved higher so they execute early enough:


And these are the files left in the actual backend folder:


So the icons are actually still in the backend folder.
Still, I tried copying the controller_ui folder over into my higher priority folder real quick and changed the file path to that to see if this was maybe a priority issue too, but the error message remained.

Have you modified or removed custom events, or added your own icon buttons to the screen? It looks like it's trying to find a pad event, and there isn't a match.

I don't believe I've removed any custom events, though I did make 4 new .svg button images for the m, n and p keys, as well as all the arrow keys together. Defined them in the controller_icons.rpy as well, this is the relevant code I've added for them there:
 

define icn.mute = IconButton("ToggleMute", ["m", "M"], _(""), "key_m")
define icn.arrowkeys = IconButton("", ["K_LEFT", "K_RIGHT", "K_UP", "K_DOWN"], _(""), "key_arrowkeys")
define icn.n = IconButton("", ["n", "N"], _(""), "key_n")
define icn.p = IconButton("", ["p", "P"], _(""), "key_p")

Ah, I see - none of those buttons have valid controller events. Thus, the game has no way to look up events associated with those buttons. IconButton is intended to have a mapping both for keyboard and for controller. If you just want to make a mouse & keyboard button with no controller equivalent, there's no need to use IconButton at all, since most of its conveniences are tied to picking the right icon set and allowing for remapping, none of which is offered for keyboard shortcuts. You can just make your own imagebutton with a keysym.

Ohh, I see! That makes sense, also explains the issue. After replacing the icon buttons with imagebutton equivalents, the issue has now resolved itself. Thank you for all of your help!