I have installed version 5.1.9 with Ajax plugins. I am trying to format some rows as function like in your video https://www.youtube.com/watch?v=XjktWk1Q_OA.
I have created MyHelpers.php file with MyHelpers class, added function: 	 

/* Format Booking Status */
	 static public function bookingStatus($b_status)
	 {
	 	if($b_status ==1):
	 		return '<span class="label label-danger"> NEW ORDER </span>';
	 	
	 	elseif($b_status ==5):
	 		return '<span class="label label-primary"> CANCELLED </span>';
	 	
	 	else($b_status ==3):
	 		return  '<span class="label label-success"> ASSIGNED </span>';
	 	
	 }
	 
I did run locally 'composer dump-autoload' and uploaded files back to the server.Next I registered function in Sximo:
MyHelpers|bookingStatus|booking_statuses_id

After rebuilding I have a screen with spinning wheel, like it cannot load a table. Console shows:
GET http: ... cp/public/bookings/data 500 (Internal Server Error)

Please help me on that.