phpstudy reports an error when configuring a virtual host. What is the problem?

Question

thinkphp was created through composer, version 5.1.0. I used phpstudy to configure the virtual host in Windows and got an error when opening public. I don’t know the reason. Can someone check it out?

Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in C: \myphp_www\PHPTutorial\WWW\zh\thinkphp\base.php on line 33