Minified stylesheets turning up 404 error

<link rel="stylesheet" type="text/css" href="//www.michaeltyler.co.uk/wp-content/cache/wpfc-minified/a5a656c9322d735d675c6ece302d1d4a/.." media="screen">
<link rel="stylesheet" href="//www.michaeltyler.co.uk/wp-content/cache/wpfc-minified/a1cf02bbf1610d7d86173e3996157429/..">
<link rel="stylesheet" id="al2fb_style-css" href="http://www.michaeltyler.co.uk/wp-content/plugins/add-link-to-facebook/add-link-to-facebook.css?ver=4.0.1" type="text/css" media="all">
<link rel="stylesheet" id="z-flickr-css" href="//www.michaeltyler.co.uk/wp-content/cache/wpfc-minified/744b06b51bfdbcc7a1c20c8b24a088eb/.." type="text/css" media="screen">
<link rel="stylesheet" id="wpt-twitter-feed-css" href="http://www.michaeltyler.co.uk/wp-content/plugins/wp-to-twitter/css/twitter-feed.css?ver=4.0.1" type="text/css" media="all">
<link rel="stylesheet" id="contango-css-960-css" href="http://www.michaeltyler.co.uk/wp-content/themes/contango/lib/css/960.css?ver=4.0.1" type="text/css" media="all">
<link rel="stylesheet" id="wordpress-popular-posts-css" href="http://www.michaeltyler.co.uk/wp-content/plugins/wordpress-popular-posts/style/wpp.css?ver=3.2.1" type="text/css" media="all">
<link rel="stylesheet" id="afg_colorbox_css-css" href="http://www.michaeltyler.co.uk/wp-content/plugins/awesome-flickr-gallery-plugin-3.tmp/colorbox/colorbox.css?ver=4.0.1" type="text/css" media="all">
<link rel="stylesheet" id="afg_css-css" href="http://www.michaeltyler.co.uk/wp-content/plugins/awesome-flickr-gallery-plugin-3.tmp/afg.css?ver=4.0.1" type="text/css" media="all">
<link rel="stylesheet" id="wppa_style-css" href="http://www.michaeltyler.co.uk/wp-content/plugins/wp-photo-album-plus/theme/wppa-style.css?ver=6-0-0-000" type="text/css" media="all">
<link rel='stylesheet' href='http://www.michaeltyler.co.uk/wp-content/cache/wpfc-minified/a249a9bfcb990aa0c33b23cb8ba1a74a/..' type="text/css" media="screen" />
<link rel='stylesheet' href='http://www.michaeltyler.co.uk/wp-content/cache/wpfc-minified/4221c41eb2db9c064e6cb34fbc6b0552/..' type="text/css" media="all" />
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This shows the stylesheets and the relative addresses.

I’m wondering why all the stylesheets cached by wpfc are turning up 404 errors.

https://wordpress.org/plugins/wp-fastest-cache/