Vimeo Shortcode: shortcode() should not be called statically

Hello,
Can you please tell me why i get this message above the video in my page? Although the video is showing up normally.

Strict Standards: call_user_func() expects parameter 1 to be a valid callback, non-static method lux_vimeo::shortcode() should not be called statically in /home/john/public_html/wp-includes/shortcodes.php on line 287

Thanks in advance