FileNotFoundError after trying to install GE-Proton in Steam Snap

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Describe the bug
I tried to install GE-Proton, the last version 9.2 I think. After the download finished, the program crashed with an error message. I tried to reopen the application, but now it won't open and give me an error message.

Traceback (most recent call last):
  File "/tmp/.mount_ProtonR87rBj/usr/lib/python3.8/runpy.py", line 193, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/tmp/.mount_ProtonR87rBj/usr/lib/python3.8/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/tmp/.mount_ProtonR87rBj/usr/lib/python3.8/site-packages/pupgui2/__main__.py", line 2, in <module>
    main()
  File "/tmp/.mount_ProtonR87rBj/usr/lib/python3.8/site-packages/pupgui2/pupgui2.py", line 571, in main
    MainWindow()
  File "/tmp/.mount_ProtonR87rBj/usr/lib/python3.8/site-packages/pupgui2/pupgui2.py", line 109, in __init__
    self.update_ui()
  File "/tmp/.mount_ProtonR87rBj/usr/lib/python3.8/site-packages/pupgui2/pupgui2.py", line 230, in update_ui
    global_ctool_name: str = get_steam_global_ctool_name(install_loc.get('vdf_dir'))
  File "/tmp/.mount_ProtonR87rBj/usr/lib/python3.8/site-packages/pupgui2/steamutil.py", line 206, in get_steam_global_ctool_name
    d = get_steam_vdf_compat_tool_mapping(vdf.load(open(config_vdf_file)))
FileNotFoundError: [Errno 2] No such file or directory: '/home/deewens/snap/steam/common/.steam/root/config/config.vdf'

To Reproduce
Steps to reproduce the behavior:

Open GE-Proton AppImage
Install GE-Proton last version for the Steam Snap
You'll get an error message and the app will crash
If you try to reopen the AppImage, it won't and crash immediately with the error message describe above

Expected behavior
No error message and GE-Proton to install in Steam.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

Platform: Desktop PC
System: Ubutun 23.10
Version: 2.9.1
How did you install ProtonUp-Qt?: AppImage

Additional context
I'm running the Snap version of Steam, and tried to use the AppImage version of ProtonUp-Qt, because Ubuntu does not install Flatpak out-of-the box, and I don't want to install GNOME Software in addition to the Ubuntu Software.

Terminal output

Open the Terminal app and type one of the following commands and press Enter (The app is called "Konsole" on Steam Deck):

If you installed ProtonUp-Qt via Flatpak (Discover on Steam Deck), type:
flatpak run net.davidotek.pupgui2

If you have downloaded the AppImage, navigate to the folder containing the AppImage file and type:
./ProtonUp-Qt*.AppImage

Try to replicate the bug and paste the text output of the command here afterwards.

pImage ProtonUp-Qt 2.9.1 by DavidoTek. Build Info: Official AppImage by DavidoTek. Python 3.8.2 (default, Mar 13 2020, 10:14:16) [GCC 9.3.0], PySide 6.2.4 Platform: Ubuntu 23.10 Linux-6.5.0-26-generic-x86_64-with-glibc2.29 Warning: Ignoring WAYLAND_DISPLAY on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway. Loading locale en / en_US Loaded ctmod GE-Proton Loaded ctmod Wine-GE Loaded ctmod Boxtron Loaded ctmod D8VK (nightly) Loaded ctmod Kron4ek Wine-Builds Vanilla Loaded ctmod Lutris-Wine Loaded ctmod Luxtorpeda Loaded ctmod Northstar Proton (Titanfall 2) Loaded ctmod Proton Tkg Loaded ctmod Proton Tkg (Wine Master) Loaded ctmod Roberta Loaded ctmod Steam-Play-None Loaded ctmod SteamTinkerLaunch Loaded ctmod SteamTinkerLaunch-git Loaded ctmod vkd3d-lutris Loaded ctmod vkd3d-proton Loaded ctmod Wine Tkg (Valve Wine) Loaded ctmod Wine Tkg (Vanilla Wine) Loaded ctmod DXVK Loaded ctmod DXVK Async Loaded ctmod DXVK (nightly) qt.pysideplugin: Environment variable PYSIDE_DESIGNER_PLUGINS is not set, bailing out. qt.pysideplugin: No instance of QPyDesignerCustomWidgetCollection was found. Error: Could not get a list of all Steam apps: [Errno 2] No such file or directory: '/home/deewens/snap/steam/common/.steam/root/config/libraryfolders.vdf' Traceback (most recent call last): File "/tmp/.mount_ProtonnXJhKR/usr/lib/python3.8/runpy.py", line 193, in _run_module_as_main return _run_code(code, main_globals, None, File "/tmp/.mount_ProtonnXJhKR/usr/lib/python3.8/runpy.py", line 86, in _run_code exec(code, run_globals) File "/tmp/.mount_ProtonnXJhKR/usr/lib/python3.8/site-packages/pupgui2/main.py", line 2, in main() File "/tmp/.mount_ProtonnXJhKR/usr/lib/python3.8/site-packages/pupgui2/pupgui2.py", line 571, in main MainWindow() File "/tmp/.mount_ProtonnXJhKR/usr/lib/python3.8/site-packages/pupgui2/pupgui2.py", line 109, in init self.update_ui() File "/tmp/.mount_ProtonnXJhKR/usr/lib/python3.8/site-packages/pupgui2/pupgui2.py", line 230, in update_ui global_ctool_name: str = get_steam_global_ctool_name(install_loc.get('vdf_dir')) File "/tmp/.mount_ProtonnXJhKR/usr/lib/python3.8/site-packages/pupgui2/steamutil.py", line 206, in get_steam_global_ctool_name d = get_steam_vdf_compat_tool_mapping(vdf.load(open(config_vdf_file))) FileNotFoundError: [Errno 2] No such file or directory: '/home/deewens/snap/steam/common/.steam/root/config/config.vdf'

Gamepad error: No gamepad found.

DavidoTek / ProtonUp-Qt

FileNotFoundError after trying to install GE-Proton in Steam Snap #368