When I was designing the site on a temporary domain the fonts worked fine (I was using Montserrat) however when I transferred to the domain we want to use the fonts are showing up as an error. 

I inspected the page in chrome and it resulted with the error I have shown in the screenshot attached. 

I have also attached a screenshot of what it is supposed to look like. 

Please can you advise me on how to fix this error. 

Thanks

SOLVED 

I have solved this problem now. I just had to find the CSS for 'Montserrat' and add it to the style sheet for the new site within the theme options panel. 

I'm having this exact problem. Please how did you add the css? Thanks :(