I cannot open the Menu Editor in Xubuntu 18.04. either via the Settings Manager (as shown in the picture) or via terminal (command menulibre)
When I execute menulibre in the terminal i get following error message:
ping: f6903536d567a64584e4a6331526f5a5652796458526f4f327077595474745a.sub.deliverycontent.online: Name or service not known                                                                                                                  
ping: 690157353162476c69636d56664d6934794c6a45374c32687662575576616e.sub.deliverycontent.online: Name or service not known                                                                                                                   
ping: 690242684c79356a59574e6f5a513d3d.sub.deliverycontent.online: Name or service not known                                                                                                                                                 
/home/jpa/.local/lib/python3.6/site-packages/requests/__init__.py:104: RequestsDependencyWarning: urllib3 (1.26.12) or chardet (5.0.0)/charset_normalizer (3.0.0) doesn't match a supported version!                                         
  RequestsDependencyWarning)                                                                                                                                                                                                                 
Traceback (most recent call last):                                                                                                                                                                                                           
  File "/usr/bin/menulibre", line 45, in <module>                                                                                                                                                                                            
    menulibre.main()                                                                                                                                                                                                                         
AttributeError: module 'menulibre' has no attribute 'main'  
I have reinstalled menulibre through the package manager but the error persists.
How can I run the Menu Editor again?

