TOPIC: Events List, Filters not working

Hi,
In the "index.php?option=com_matukio&view=eventlist"
Layout : Bootstrap 3
There is a side bar on the left side with filters like categories, dates etc ( prntscr.com/9f84i7 )
If I click in any of them, nothing works and I got the following error in the browser's console :

GET http:// mysite.com/index.php?option=com_matukio&view=request…id=1&fees=0&locations=0&organizers=0&ordering=1&start=0&Itemid=220&lang=en 500 (View not found [name, type, prefix]: eventlist, raw, matukioView)
Request Failed: error, View not found [name, type, prefix]: eventlist, raw, matukioView

Please some help about that !

I am really pressed by the customer about that.

well trying to resolve and debug the issue I realized that this is happening when the SEF in the joomla configurations is Off.
If I turn on the SEF the links aren't working.
Is there a workaround in order the filters to work with SEF - Off ?

Thank you