pix_url is deprecated. Use image_url for images and pix_icon for icons.

• line 267 of /lib/outputrenderers.php: call to debugging()
• line 128 of /theme/clean/layout/columns3.php: call to renderer_base->pix_url()
• line 1261 of /lib/outputrenderers.php: call to include()
• line 1191 of /lib/outputrenderers.php: call to core_renderer->render_page_layout()
• line 112 of /index.php: call to core_renderer->header()