Clear cache: 
<br />
<b>Notice</b>:  Undefined variable: wp_version in <b>/srv/webs/MedienLemma/cdn/caching/ml-clearcache.php</b> on line <b>23</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function home_url() in /srv/webs/MedienLemma/cdn/caching/ml-clearcache.php:23
Stack trace:
#0 {main}
  thrown in <b>/srv/webs/MedienLemma/cdn/caching/ml-clearcache.php</b> on line <b>23</b><br />