登录失败

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按wiki的配置，执行了libsystem.sql，然后尝试用管理员登录，提示失败如下： Fatal error: Uncaught Error: Call to a member function fetch_assoc() on boolean in C:\xampp\htdocs\libsystem\conn.php:19 Stack trace: #0 C:\xampp\htdocs\libsystem\admin\index.php(21): conn->fetch_res() #1 {main} thrown in C:\xampp\htdocs\libsystem\conn.php on line 19