HOW TO: Fix the Custom File Editor’s Fatal Call Error in Thesis Theme on WordPress 3.0

If you have upgraded to WordPress 3.0 and use the Thesis theme, you may have noticed that now you receive a fatal call error when trying to access your custom.css file via the Custom File Editor within your Thesis options that looks something like this:

Fatal error: Call to undefined function use_codepress() in /DIRECTORY/public_html/wp-content/themes/thesis_17/lib/admin/admin.php on line 42

In order to correct this, you’ll need to disable the syntax highlighter, which is what is creating the issue. Doing this is simple.

• Find your admin.php file located in /wp-content/themes/thesis_17/lib/admin/ (you’ll need to download an FTP client if you don’t already have one — my favorite is FileZilla)
• Open your Notepad or other text/html editor (do not do this in Word or any other program that uses an autoformatting feature)
• Hold down your CTRL key and press the “F” key. This should pop up a find function. Paste the following string into the box and search for it in your file:

if (use_codepress()) add_action('admin_print_footer_scripts', 'codepress_footer_js');

• Comment that line out of the file by placing “//” in front of it like this:

// if (use_codepress()) add_action('admin_print_footer_scripts', 'codepress_footer_js');

• Reupload your file using the FTP client

VOILA! You’re done. Reload your Custom File Editor and it should work like a charm. Of course, the syntax highlighter is now disabled, but at least you can access your custom.css file from within your WordPress dashboard! :) Happy blogging to ya!