Why doesnt the image load?

for some reason the mario image wont load in the game
the forest.png is the background if you were to run
and the mario.png is the character
I have done some tests but no matter what it keeps not loading
this is also the game from the Tech With Tim tutorial I followed it line by line
yet it still doesn’t work
(No errors it just doesnt load the character)

import pygame
import os, sys
pygame.init()

win = pygame.display.set_mode((500,500))


pygame.display.set_caption("the game!!!")
APP_FOLDER = os.path.dirname(os.path.realpath(sys.argv[0]))

#background_image = pygame.image.load(r"C:UsersNONAMEDesktopCodingGamesLearningforest.png").convert()
background_image = pygame.image.load(os.path.join(APP_FOLDER, 'forest.png')).convert()

#mario = pygame.image.load(r"C:UsersNO NAMEDesktopCodingGamesLearningmario.png").convert()
R_mario = pygame.image.load(os.path.join(APP_FOLDER, 'mario.png')).convert()
L_mario = pygame.transform.flip(R_mario, True, False)


screenWidth = 500
x = 50
y = 425
width = 40
height = 60
vel = 10
isJump = False
jumpCount = 10
left = False    
right = True
walkcount = 0

def redrawGameWindow():
    global walkcount

    win.blit(background_image, [0, 0])
    
    pygame.display.update()

    if left == True:
        win.blit(L_mario, (x, y))
        print("work left")
    elif right == True:
        win.blit(R_mario, (x, y))
        print("work right")


#mainloop
run = True
while run:
    pygame.time.delay(27)

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    keys = pygame.key.get_pressed()

    if keys[pygame.K_LEFT] and x > vel:
        x -= vel
        Left = True
        right = False
    elif keys[pygame.K_a] and x > vel:
        x -= vel
        right = True
        left = False
    else:
        right = False
        left = False

    if keys[pygame.K_RIGHT] and x < screenWidth - width - vel:
        x += vel
    if keys[pygame.K_d] and x < screenWidth - width - vel:
        x += vel

    if not(isJump):
        if keys[pygame.K_SPACE]:
            isJump = True
    else:
        if jumpCount >= -10:
            neg = 1
            if jumpCount < 0:
                neg = -1
            y -= (jumpCount ** 2) * 0.5 * neg
            jumpCount -= 1
        else:
            isJump = False
            jumpCount = 10

    redrawGameWindow()


pygame.quit()