Fatal error: Uncaught think\exception\ErrorException: Cannot modify header information - headers already sent by (output started at /data/wwwroot/new_www_16shouyou/config/app.php:1) in /data/wwwroot/new_www_16shouyou/public/404.html:2 Stack trace: #0 [internal function]: think\Error::appError(2, 'Cannot modify h...', '/data/wwwroot/n...', 2, Array) #1 /data/wwwroot/new_www_16shouyou/public/404.html(2): header('HTTP/1.1 404 No...') #2 /data/wwwroot/new_www_16shouyou/thinkphp/library/think/exception/Handle.php(184): include('/data/wwwroot/n...') #3 /data/wwwroot/new_www_16shouyou/thinkphp/library/think/exception/Handle.php(97): think\exception\Handle->convertExceptionToResponse(Object(think\exception\ErrorException)) #4 /data/wwwroot/new_www_16shouyou/thinkphp/library/think/Error.php(50): think\exception\Handle->render(Object(think\exception\ErrorException)) #5 /data/wwwroot/new_www_16shouyou/thinkphp/library/think/Error.php(84): think\Error::appException(Object(think\exception\ErrorException)) #6 [internal function]: think in /data/wwwroot/new_www_16shouyou/public/404.html on line 2