When I try to apply for fullscreen its says 'We're sorry, but something went wrong'

[LiamsPokebelt]

so when i tryed to apply for full screen,like after i click accept after it says we can have access to your views etc etc.. i click yes and it says'
We're sorry, but something went wrong

 

[unknown_user0032]

Contact Fullscreen. That may not sound helpful, but you need FS support, not us for that one.