Python AttributeError: 'module' object has no attribute 'Serial'

This is my first project with Python (disclaimer: I have very little programming experience), it's supposed to turn on an LED when I receive a message, but this error appears when I run it (I am running it on Windows 10, 64 bits).

What can I do in order to fix it? Thanks in advance and sorry for any dumb mistake I may have committed.

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Answered by imcraft [earned 5 cycles]
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Thanks @imcraft, now it works!