RTL issue with WP 4.8

I am using version 4.7.3 of the plugin on my site https://www.avelim.co.il/

After upgrading to wordpress 4.8, when editing a post in the dashboard I get the error

Failed to load content css: https://www.avelim.co.il/wp-content/uploads/useanyfont/admin-uaf-rtl.css

I deactivated the plugin for now. Can you fix this please