The selected file /tmp/filemwRIcD could not be uploaded, because the destination sites/default/files/css/css_a91cd284035e73ba34d112bfed2f5a16.css is not properly configured.
  The selected file /tmp/fileOH8t1D could not be uploaded, because the destination sites/default/files/css/css_de1aa27776f1462d2b0d83a80ce4b92d.css is not properly configured.

This setting determines how many columns are in the current Layout.