Error when updating

Hi, whenever I try to update GeneratePress, I get the following error:

An error occurred while updating GeneratePress: The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions. generatepress/style.css, generatepress/searchform.php, generatepress/content.php, generatepress/footer.php, generatepress/screenshot.png, generatepress/rtl.css, generatepress/content-single.php, generatepress/sidebar.php, generatepress/search.php, generatepress/sidebar-left.php, generatepress/changelog.txt, generatepress/no-results.php, generatepress/style.unmin.css, generatepress/archive.php, generatepress/content-link.php, generatepress/page.php, generatepress/index.php, generatepress/header.php, generatepress/single.php, generatepress/content-page.php, generatepress/functions.php, generatepress/readme.txt, generatepress/404.php, generatepress/comments.php, generatepress/inc/navigation.php, generatepress/inc/add-ons.php, generatepress/inc/options.php, generatepress/inc/template-tags.php, generatepress/inc/sanitize.php, generatepress/inc/metaboxes.php, generatepress/inc/element-classes.php, generatepress/inc/extras.php, generatepress/inc/woocommerce.php, generatepress/inc/customizer.php, generatepress/inc/controls.php, generatepress/js/dropdown-click.min.js, generatepress/js/move-navigation.min.js, generatepress/js/dropdown-click.js, generatepress/js/navigation-search.min.js, generatepress/js/back-to-top.min.js, generatepress/js/html5shiv.min.js, generatepress/js/html5shiv.js, generatepress/js/move-navigation.js, generatepress/js/navigation.min.js, generatepress/js/dropdown.js, generatepress/js/dropdown.min.js, generatepress/js/navigation.js, generatepress/js/navigation-search.js, generatepress/js/back-to-top.js, generatepress/css/font-awesome-essentials.css, generatepress/css/mobile.min.css, generatepress/css/font-awesome.min.css, generatepress/css/font-awesome.css, generatepress/css/font-awesome-essentials.min.css, generatepress/css/ie.min.css, generatepress/css/ie.css, generatepress/css/mobile.css, generatepress/css/unsemantic-grid.css, generatepress/css/unsemantic-grid.min.css, generatepress/fonts/fontawesome-webfont.ttf, generatepress/fonts/generatepress.woff, generatepress/fonts/fontawesome-webfont.woff, generatepress/fonts/fontawesome-webfont.eot, generatepress/fonts/fontawesome-webfont.svg, generatepress/fonts/generatepress.svg, generatepress/fonts/fontawesome-webfont.woff2, generatepress/fonts/generatepress.eot, generatepress/fonts/FontAwesome.otf, generatepress/fonts/generatepress.ttf, generatepress/inc/add-ons/colors.php, generatepress/inc/add-ons/spacing.php, generatepress/inc/add-ons/typography.php, generatepress/inc/add-ons/controls.php, generatepress/inc/add-ons/disable-elements.php, generatepress/inc/js/fonts-customizer.js, generatepress/inc/js/customcontrol.slider.js, generatepress/inc/js/customizer.js, generatepress/inc/css/style.css, generatepress/inc/css/jquery-ui.structure.css, generatepress/inc/css/editor-style.css, generatepress/inc/css/jquery-ui.theme.css, generatepress/inc/css/customizer.css, generatepress/inc/add-ons/images/backgrounds.png, generatepress/inc/add-ons/images/sections.png, generatepress/inc/add-ons/images/typography.png, generatepress/inc/add-ons/images/disable-items.png, generatepress/inc/add-ons/images/copyright.png, generatepress/inc/add-ons/images/hooks.png, generatepress/inc/add-ons/images/menu-plus.png, generatepress/inc/add-ons/images/blog.png, generatepress/inc/add-ons/images/colors.png, generatepress/inc/add-ons/images/secondarynav.png, generatepress/inc/add-ons/images/importexport.png, generatepress/inc/add-ons/images/spacing.png, generatepress/inc/add-ons/images/page-header.png, generatepress/inc/css/fonts/gp-customizer.svg, generatepress/inc/css/fonts/gp-customizer.eot, generatepress/inc/css/fonts/gp-customizer.ttf, generatepress/inc/css/fonts/gp-customizer.woff