getting error in terminal when i try to apply a theme

[millionsofplayers]

TypeError: Must be number, not NoneType
Traceback (most recent call last):
  File "/app/share/rewaita/rewaita/window.py", line 218, in on_theme_button_clicked
    self.on_theme_selected()
    ~~~~~~~~~~~~~~~~~~~~~~^^
  File "/app/share/rewaita/rewaita/window.py", line 180, in on_theme_selected
    parse_gtk_theme(
    ~~~~~~~~~~~~~~~^
        colors,
        ^^^^^^^
    ...<6 lines>...
        reset_shell
        ^^^^^^^^^^^
    )
    ^
  File "/app/share/rewaita/rewaita/utils.py", line 84, in parse_gtk_theme
    file = shutil.copyfile(theme_file, os.path.join(gnome_shell_theme_dir, "gnome-shell.css"))
  File "/usr/lib/python3.13/shutil.py", line 262, in copyfile
    with open(dst, 'wb') as fdst:
         ~~~~^^^^^^^^^^^
OSError: [Errno 30] Read-only file system: '/home/millions/.local/share/themes/rewaita/gnome-shell/gnome-shell.css'

i know why the read only error at the end is happening and thats not what i want to find the solution to, the other non gnome shell theme stuff is though