Error message

• Deprecated function: file_exists(): Passing null to parameter #1 ($filename) of type string is deprecated in ctools_css_retrieve() (line 103 of /mnt/web020/d3/87/5936887/htdocs/sites/all/modules/ctools/includes/css.inc).
• Unable to create CTools CSS cache directory. Check the permissions on your files directory.
• Unable to create CTools CSS cache directory. Check the permissions on your files directory.