Error Call to undefined function OCA Theming mime_content_type

Error index Error: Call to undefined function OCA\Theming\mime_content_type()
/home/danfar50/onespace.danyaahla.com/apps/theming/lib/IconBuilder.php - line 55: OCA\Theming\IconBuilder->renderAppIcon(‘settings’, 32)
/home/danfar50/onespace.danyaahla.com/apps/theming/lib/Controller/IconController.php - line 130: OCA\Theming\IconBuilder->getFavicon(‘settings’)
[internal function] OCA\Theming\Controller\IconController->getFavicon(‘settings’)
/home/danfar50/onespace.danyaahla.com/lib/private/AppFramework/Http/Dispatcher.php - line 160: call_user_func_array(Array, Array)
/home/danfar50/onespace.danyaahla.com/lib/private/AppFramework/Http/Dispatcher.php - line 90: OC\AppFramework\Http\Dispatcher->executeController(Object(OCA\Theming\Controller\IconController), ‘getFavicon’)
/home/danfar50/onespace.danyaahla.com/lib/private/AppFramework/App.php - line 114: OC\AppFramework\Http\Dispatcher->dispatch(Object(OCA\Theming\Controller\IconController), ‘getFavicon’)
/home/danfar50/onespace.danyaahla.com/lib/private/AppFramework/Routing/RouteActionHandler.php - line 47: OC\AppFramework\App main(‘OCA\Theming\Con…’, ‘getFavicon’, Object(OC\AppFramework\DependencyInjection\DIContainer), Array)
[internal function] OC\AppFramework\Routing\RouteActionHandler->__invoke(Array)
/home/danfar50/onespace.danyaahla.com/lib/private/Route/Router.php - line 299: call_user_func(Object(OC\AppFramework\Routing\RouteActionHandler), Array)
/home/danfar50/onespace.danyaahla.com/lib/base.php - line 1012: OC\Route\Router->match(’/apps/theming/f…’)
/home/danfar50/onespace.danyaahla.com/index.php - line 48: OC handleRequest()
{main}