Cannot modify header information - headers already sent by (output started at /www/wwwroot/travel/public/index.php:2)

Call Stack

1. in Cookie.php line 110
2. at Error::appError(2, 'Cannot modify header...', '/www/wwwroot/travel/...', 110, ['name' => 'think_var', 'value' => 'eng', 'option' => null, ...])
3. at setcookie('think_var', 'eng', 0, '/', '', false, '') in Cookie.php line 110
4. at Cookie::set('think_var', 'eng') in Common.php line 60
5. at Common->moduleInit(object(Request), null) in Hook.php line 137
6. at Hook::exec('app\common\behavior\...', 'module_init', object(Request), null) in Hook.php line 95
7. at Hook::listen('module_init', object(Request)) in App.php line 573
8. at App::module(['', null, null], ['app_host' => '', 'app_debug' => true, 'app_trace' => false, ...], true) in App.php line 456
9. at App::exec(['type' => 'module', 'module' => ['', null, null]], ['app_host' => '', 'app_debug' => true, 'app_trace' => false, ...]) in App.php line 139
10. at App::run() in start.php line 19
11. at require('/www/wwwroot/travel/...') in index.php line 24