Why is the menu not going to next page Python/pygame/pygame-menu

Question

The issue is with GameMode Value as it isn't being picked up my def Start_the_GameV2 and just need help to allow the code to continue through the pages

 ```import pygame, pygame_menu
    
    GameMode = "ShotMaking"
    
    def Starting_Menu():
        pygame.init()
        surface = pygame.display.set_mode((1920, 1080))
        menu = pygame_menu.Menu('BATTLESHIPS', 1920, 1080,
                           theme=pygame_menu.themes.THEME_GREEN)
    
        menu.add.button('Play', start_the_game)
        menu.add.button('LeaderBoard', LeaderBoard)
        menu.add.button('Quit', pygame_menu.events.EXIT)
        menu.mainloop(surface)```

This is where the diffculty slider is transferred to what gamemode ```def set_difficulty(value, difficulty, GameMode): if difficulty == 1: GameMode = "ShotMaking" else: GameMode = "Ai Oppoent" return GameMode

    def LeaderBoard():
        pass
    
    def start_the_game():
        
        pygame.init()
        surface = pygame.display.set_mode((1920, 1080))
        
        gamemenu = pygame_menu.Menu('BATTLESHIPS', 1920, 1080,
                           theme=pygame_menu.themes.THEME_DARK)
    
        gamemenu.add.button('Back', Starting_Menu)
        gamemenu.add.text_input('Username :', default='')
        gamemenu.add.text_input('Passcode :', default='')
        gamemenu.add.selector('Mode :', [('Shot Making', 1), ('Ai Opponant', 2)], onchange=set_difficulty)
        gamemenu.add.button('Play', Start_The_GameV2)
        gamemenu.mainloop(surface)```

This is the subroutine where the code fails
```def Start_The_GameV2(): pygame.init() surface = pygame.display.set_mode((1920, 1080))

        gamemenuv2 = pygame_menu.Menu('BATTLESHIPS', 1920, 1080,
                           theme=pygame_menu.themes.THEME_DARK)
   
        gamemenuv2.add.button("Continue", GameMode)
        gamemenuv2.add.button('Back', start_the_game)
        gamemenuv2.mainloop(surface)
    
    
        Starting_Menu()```