Hustle plugin not working for me

Hello,

I’m running a multisite on WordPress 4.5.3 with Membership 2 pro activated (and a lot of other plugins as well as wpLayers) and installed and network activated Hustle.

I can see it in the menu but when I try to access his pages (new and lists) I get a blank page.

Looking at it with debug on, I get this kind of messages:

Notice: add_option was called with an argument that is deprecated since version 2.3 with no alternative available. in […]/wp-includes/functions.php on line 3844

Notice: wp_enqueue_script was called incorrectly. Scripts and styles should not be registered or enqueued until the wp_enqueue_scripts, admin_enqueue_scripts, or login_enqueue_scripts hooks. Please see Debugging in WordPress for more information. (This message was added in version 3.3.) in […]/wp-includes/functions.php on line 3897

Do you have any idea on why?

All other plugins are working.

Thank you

Federico