Can't add new group of devices

Hello support,

I open this ticket for the following problem : 

I have just created a new instance of Observium. We are using the Professional Edition.

I tried to add a new group following this steps :

I added a filter who needs to match "situaction" sysname of devices :

And it shows me "An error has occured".

It should match those devices :

Could you please advise? 

If you need any information, don't hesitate.

Thank you,