Error message

• Notice: Undefined index: cantina in drupal_theme_initialize() (line 100 of /home/ethio/public_html/includes/theme.inc).
• Notice: Trying to get property of non-object in _drupal_theme_initialize() (line 146 of /home/ethio/public_html/includes/theme.inc).
• Notice: Trying to get property of non-object in eval() (line 8 of /home/ethio/public_html/sites/all/modules/contrib/ds/modules/ds_format/ds_format.module(66) : eval()'d code).
• Notice: Trying to get property of non-object in _theme_load_registry() (line 335 of /home/ethio/public_html/includes/theme.inc).
• Notice: Undefined index: cantina in theme_get_setting() (line 1439 of /home/ethio/public_html/includes/theme.inc).