[Python] Trying to concatanate a list of images to make a video but i get a error

[This is a screenshot ofHeres a screenshot of the error code block]2Heres the code:

import os
from moviepy.editor import *

Memes = []
numLabel = 0

for pictures in os.listdir("memes"):
ImageClip("memes/" + pictures).set_duration(5)
Memes.append(pictures)

video = concatenate(Memes, method="compose")
video.write_videofile('test.mp4', fps=24)


I get this error:

'str' object has no attribute 'duration'

as you can see there is a duration assigned to the list of memes please help me I wasted 3 days on this error

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