Ssh x11 forwarding - Cannot load backend 'TkAgg' which requires the 'tk' interactive framework, as 'headless' is currently running

Python Help
,
1

Hi all, I have a problem with my server machine and matplotlib. I connect to centos server machine enabling x11Forwarding and I have on windows Xming. When I run on server machine (connecting with putty) the simple test code:

import matplotlib 
matplotlib.use('TKAgg')
import matplotlib.pyplot as plt
plt.plot([1, 2, 3, 4])
plt.ylabel('some numbers')
plt.show()

I obtain the following error:

 import matplotlib.pyplot as plt
  File "/usr/local/lib/python3.8/site-packages/matplotlib/pyplot.py", line 2500, in <module>
    switch_backend(rcParams["backend"])
  File "/usr/local/lib/python3.8/site-packages/matplotlib/pyplot.py", line 285, in switch_backend
    raise ImportError(
ImportError: Cannot load backend 'TkAgg' which requires the 'tk' interactive framework, as 'headless' is currently running

the same when I connect with VScode with the following ssh configurations:

Host 192.168.1.10
HostName 192.168.1.10
User root
Port 22
IdentityFile C:\Users.ssh\id_rsa
ForwardAgent yes
ForwardX11 yes
ForwardX11Trusted yes

thank you very much for your help
Best regards