Sass Compiling Error

/customers/4/9/9/cf06vqzqk/webroots/r1137535/wp-content/themes/futureofbusiness/customers/4/9/9/cf06vqzqk/webroots/r1137535/wp-content/plugins/wp-scss/cache/
"File Permission Error, permission denied. Please make the cache directory writable."

https://www.futureofbusiness.io/wp-sitemap-posts-post-1.xmlhttps://www.futureofbusiness.io/wp-sitemap-posts-page-1.xmlhttps://www.futureofbusiness.io/wp-sitemap-posts-tribe_venue-1.xmlhttps://www.futureofbusiness.io/wp-sitemap-posts-tribe_organizer-1.xmlhttps://www.futureofbusiness.io/wp-sitemap-posts-tribe_events-1.xmlhttps://www.futureofbusiness.io/wp-sitemap-taxonomies-category-1.xmlhttps://www.futureofbusiness.io/wp-sitemap-users-1.xml