Dear Support Team,
i installed as002057_quickstart with test content. The installation finished successfully. But when i try to open my site i get an error:

0 - Using $this when not in object context

Please help!
Regards Heinz

Joomla Version 3.8.0
PHP Built On Linux www70.world4you.com 3.10.0-714.10.2.lve1.5.17.1.el6h.x86_64 #1 SMP Tue May 22 11:27:30 EDT 2018 x86_64

Database Version 5.5.59
Database Collation utf8_general_ci
Database Connection Collation utf8mb4_general_ci
PHP Version 7.2.10
Web Server Apache
WebServer to PHP Interface cgi-fcgi

Joomla! Version Joomla! 3.8.0 Stable [ Amani ] 19-September-2017 14:00 GMT
Joomla! Platform Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36