[Python] Problem: Pyinstaller installing FPDF2-Module -> module not found

I have installed fpdf2 with pip and afterwards I want to Installing it as a .exe with pyinstaller (Python 3.9). The code is running in the script, but after installing and starting the .exe I got from the .exe the error message:

Traceback (most recent call last):
File "example.py", line 1, in <module>
ModuleNotFoundError: No module named 'fpdf'


Pip installing:

`pip install fpdf2`


Command for pyinstaller:

pyinstaller example.py --onefile

Code of Example.py:

from fpdf import FPDF

pdf = FPDF(orientation="P", unit="mm", format="A4")
pdf.add_page()
pdf.set_left_margin(20)
pdf.set_right_margin(20)
pdf.set_top_margin(25)
pdf.set_font("helvetica", "", 16)
text_for_pdf = "Hello World"
pdf.multi_cell(0, 5, txt=text_for_pdf)
pdf.output("hello_world.pdf")



I have already updated all the modules and my Python version is 3.9. I have also tried:

pyinstaller example.py --onefile --hidden-import "fpdf"


I hope you understand my problem, thank you for helping my out! Best regards

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