Warning: current() expects parameter 1 to be array, null given in system/modules/core/classes/Frontend.php on line 192 
#0 [internal function]: __error(2, 'current() expec...', '/www/htdocs/w01...', 192, Array)
#1 system/modules/core/classes/Frontend.php(192): current(NULL)
#2 index.php(76): Contao\Frontend::getPageIdFromUrl()
#3 index.php(444): Index->run()
#4 {main}

Warning: Cannot modify header information - headers already sent by (output started at /www/htdocs/w01d3992/hautarzt-aachen-alberty.de/system/helper/functions.php:70) in system/modules/core/classes/Frontend.php on line 339 
#0 [internal function]: __error(2, 'Cannot modify h...', '/www/htdocs/w01...', 339, Array)
#1 system/modules/core/classes/Frontend.php(339): header('HTTP/1.1 404 No...')
#2 system/modules/core/pages/PageError404.php(58): Contao\Frontend::getRootPageFromUrl()
#3 index.php(91): Contao\PageError404->generate(false)
#4 index.php(444): Index->run()
#5 {main}
No root page found

No root page found

What's the matter?

There is no website root page which matches the requested language and/or domain name.

How can I fix the issue?

If you have explicitly set a language, try to go to the top level and see whether you are being redirected. Otherwise contact the webmaster and let him know that there is something wrong.

To customize this notice, create a custom template file named templates/be_no_root.html5.