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Solution to WordPress “File param is missing” no CSS

Jun 14, 2011   //   by David   //   Coding  //  No Comments

If you’ve loaded up your WordPress site and found the CSS gone, you’re not alone.

Turns out there is a new bug in the W3 Total Cache plugin of WordPress where the minified CSS and JS files aren’t accessible. Your site will throw a 400 Bad Request error and if you try to access the referenced file directly you’ll get a “File param is missing” message.

The quick fix until it is addressed by the folks at W3 Total Cache is to disable the “Rewrite URL structure” option on the Minify tab in the W3 Total Cache options panel. Hopefully it’s just temporary and the next update will resolve the issue and you can turn the rewrite back on.

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