When activating Elixir, the site goes down with a critical error. What do I do? (I have uninstalled the theme now to be able to access the site again).

Details (in Dutch)

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Een fout van het type E_ERROR werd veroorzaakt op regelnummer 29 van het bestand /home/public/sites/bardixie.hairtrigger.nl/wp-content/themes/elixir-jellythemes/inc/ReduxFramework/ReduxCore/inc/class.redux_filesystem.php. Foutmelding: Uncaught Error: Attempt to modify property "admin_notices" on null in /home/public/sites/bardixie.hairtrigger.nl/wp-content/themes/elixir-jellythemes/inc/ReduxFramework/ReduxCore/inc/class.redux_filesystem.php:29
Stack trace:
#0 /home/public/sites/bardixie.hairtrigger.nl/wp-content/themes/elixir-jellythemes/inc/ReduxFramework/ReduxCore/inc/class.redux_filesystem.php(47): Redux_Filesystem->__construct()
#1 /home/public/sites/bardixie.hairtrigger.nl/wp-content/themes/elixir-jellythemes/inc/ReduxFramework/ReduxCore/inc/class.redux_filesystem.php(286): Redux_Filesystem::get_instance()
#2 /home/public/sites/bardixie.hairtrigger.nl/wp-content/themes/elixir-jellythemes/inc/ReduxFramework/ReduxCore/framework.php(51): require_once('...')
#3 /home/public/sites/bardixie.hairtrigger.nl/wp-content/themes/elixir-jellythemes/inc/theme.options.php(5): require_once('...')
#4 /home/public/sites/bardixie.hairtrigger.nl/wp-content/themes/elixir-jellythemes/functions.php(3): require_once('...')

#5 /home/public/sites/bardixie.hairtrigger.nl/wp-settings.php(591): include('...')
#6 /home/public/sites/bardixie.hairtrigger.nl/wp-config.php(96): require_once('...')
#7 /home/public/sites/bardixie.hairtrigger.nl/wp-load.php(50): require_once('...')
#8 /home/public/sites/bardixie.hairtrigger.nl/wp-admin/admin.php(34): require_once('...')
#9 /home/public/sites/bardixie.hairtrigger.nl/wp-admin/themes.php(10): require_once('...')
#10 {main}
  thrown

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Kind regards,

Sander