Animation glitch or malfunction

I made my first animation following a tutorial from Derek Elliott, the animation of the escalator came out with a glitch, what can cause that? Sorry for the poor english.

http://pasteall.org/blend/index.php?id=53022

Thanks.

You need to change your modifier to repeat with offset. Repeat will cause the last and first frame to “repeat”. Since they are the same you have two frames that are identical thus the “glitch”.

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Thanks! I’ll try with that