Sass Compiling Error

button.css
"File Permissions Error, could not write to the CSS directory."

banner-fullwidth.css
"File Permissions Error, could not write to the CSS directory."

colours.css
"File Permissions Error, could not write to the CSS directory."

mediabreaks.css
"File Permissions Error, could not write to the CSS directory."

featured-product.css
"File Permissions Error, could not write to the CSS directory."

sale-products.css
"File Permissions Error, could not write to the CSS directory."

shortcode-container.css
"File Permissions Error, could not write to the CSS directory."