local host MAMP page blank after updating resauranteur theme

ive been building a site through mamp using local host and the restauranteur theme.
i updated the current theme while working on the site…when the update was complete, my local host page is now completely blank and i cannot access the file/site/back-end/admin page (anything) i was about to complete!

any thorough help and instruction is greatly appreciated as i have never used mamp before this project.

thanks!