Mautic is not working after Upgrade 2.1.1

Hi, we try to upgrade our mautic site mautic.connectedbusiness.com. Now it is not working and i am lost for a clue on how to fix this. Any help is appreciated

Hi, we try to upgrade our mautic site mautic.connectedbusiness.com. Now it is not working and i am lost for a clue on how to fix this. Any help is appreciated

more info please
Gracias

HI,

What info do you need me to provide? Any logs i should share? Please advice, i am not really familiar with mautic.