My sketchfab Addon for blender can´t activate in mi pc

Hello guys, i hope you´re well, i have this issue when I try to activate my addon in blender, it´s can´t make that, and the addon show me this error:

“HTTPSConnectionPool(host=‘’, port=443): Max retries exceeded with url: /oauth2/token/?grant_type=password&client_id=hGC7unF4BHyEB0s7Orz5E1mBd3LluEG0ILBiZvF9&username=&password=A (Caused by ProxyError(‘Cannot connect to proxy.’, NewConnectionError(’<urllib3.connection.HTTPSConnection object at 0x000002420C5A01F0>: Failed to establish a new connection: [WinError 10061] No se puede establecer una conexión ya que el equipo de destino denegó expresamente dicha conexión’)))”

Can you explain to me how I solve that? please