This error pops up when the virtual machine installs something through yum:
1. Check the network card installed on this machine
The network card ens33 is in disconnected state
nmcli d
2. Enter the command:
nmtui
3. Select the network card and click edit
4. Move to Automatically connect and press the space bar to select, then move to the OK key and press the space bar to select, and then press quit when returning to the previous page.
5. Enter the code to restart the network card:
systemctl restart network