Error message

• Warning: Undefined array key "mayo" in drupal_theme_initialize() (line 100 of includes/theme.inc).
• Warning: Attempt to read property "filename" on null in _drupal_theme_initialize() (line 146 of includes/theme.inc).
• Deprecated function: dirname(): Passing null to parameter #1 ($path) of type string is deprecated in _drupal_theme_initialize() (line 146 of includes/theme.inc).
• Warning: Undefined array key "mayo" in theme_get_setting() (line 1440 of includes/theme.inc).
• Warning: Attempt to read property "name" on null in _theme_load_registry() (line 335 of includes/theme.inc).
• Warning: Attempt to read property "name" on null in _theme_load_registry() (line 319 of includes/theme.inc).