DLL load failed

[flaviu2]

I have successfully ran:
pip install --upgrade matplotlib
and then I wrote in my simple Python program:
from matplotlib import pyplot
I got:
DLL load failed: The specified module could not be found.
Stack trace:
> File "D:\tempx\pythonapplication1\<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
> File "D:\tempx\pythonapplication1\<frozen importlib._bootstrap_external>", line 678, in exec_module
> File "D:\tempx\pythonapplication1\<frozen importlib._bootstrap>", line 665, in _load_unlocked
> File "D:\tempx\pythonapplication1\<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
> File "D:\tempx\pythonapplication1\<frozen importlib._bootstrap>", line 971, in _find_and_load
> File "D:\Tempx\pythonapplication1\pythonapplication1.py", line 4, in <module>
> from matplotlib import pyplot
Loaded '__main__'

What I have done wrong ?

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I'm sorry for these simple questions, but I am stuck here and I don't know how to overcome this error .... I don't see what I am doing wrong ...

Thank you for every hint/help hand,