Error while using composer - class not found #23

Hello,

Here is the log message i get after using the composer require line:

[error] 18315#0: *623 FastCGI sent in stderr: "PHP message: PHP Fatal error: Class 'SkinSkinny' not found in /wiki/vendor/tinymighty/booty-skin/base/Skin.php on line 6" while reading response header from upstream