I didn't hear from you, but I wanted to let you know that we released the update to Views that fixes the jQuery error, you might want to try updating to see if it helps, otherwise let me know the current status.
I logged in to your site and can see the errors on any Toolset-related page, meaning that it is not even possible to change settings on the Toolset settings page.
This is part of a network but I don't have superadmin rights.
Could I get those? I want to manually re-install all of the Toolset plugins.
I identified the problem and it comes from the toolset form plugin. When I disable it it works again otherwise it does not work even with the update of the latest version.
I tried to take a copy of your site (or network) but Duplicator Pro fails because of admin-ajax.php restrictions, so I'm awaiting directions from my second tier colleagues about how to proceed, and I'll let you know when I have some progress to report.
As it's not possible to take a copy of your site with Duplicator, could I get a dump of your database please, and my colleague will use that to re-construct your set-up locally for testing.
You can paste a link to the file on dropbox or similar here, it will only be visible to you and to us.
My colleague is trying to log in to the sub-site to examine the problem but cannot.
Neither can I with the superadmin credentials you provided before. I recall there was a problem with the sucuri security plugin, which I temporarily disabled to be able to gain access to confirm the problem. My colleague is not comfortable doing that.
I have working credentials to be able to log in to the network at club.sportsweek.fr.
Can you provide credentials (or instructions) for accessing the sub-site soccer-player.fr?