If you see an error similar to this it is usually a missing base-theme(solved)

Find out if the theme has a base theme, install and enable it.

Notice: Undefined property: stdClass::$prefix in system_theme_settings() (line 547 of C:\xampp\htdocs\drupal\modules\system\system.admin.inc).
Notice: Undefined index: fusion_core in system_theme_settings() (line 575 of C:\xampp\htdocs\drupal\modules\system\system.admin.inc).
Notice: Trying to get property of non-object in system_theme_settings() (line 575 of C:\xampp\htdocs\drupal\modules\system\system.admin.inc).

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