Same error with a custom network :   <network>   <name>virbr1-lab</name>   <uuid>03ca9ae6-8dbc-43b7-8e63-366b46926b20</uuid>   <forward mode='nat'/>   <bandwidth>     <inbound average='625' peak='625' burst='625'/>     <outbound average='625' peak='625' burst='625'/>   </bandwidth>   <bridge name='virbr1-lab' stp='on' delay='0'/>   <mac address='52:54:00:c5:18:43'/>   <ip address='192.168.50.1' netmask='255.255.2