Upfront Responsive Design is not working...?

I cannot edit my site in Upfront Responsive Design mode. When I click on the responsive design button, website freezes up and I cannot save.

When I click on responsive design button it does not go into responsive design mode.

Can you please help us, we are behind schedule due to this technical issue ? If not, we will be forced to go with another design option...thank you kindly.

Website:
http://sosi.life/cle/