session_start(): Cannot start session when headers already sent

Call Stack

1. in Session.php line 106
2. at Error::appError(2, 'session_start(): Can...', '/www/wwwroot/school/...', 106, ['config' => ['id' => '', 'var_session_id' => '', 'prefix' => 'think', ...], 'isDoStart' => true])
3. at session_start() in Session.php line 106
4. at Session::init() in Session.php line 120
5. at Session::boot() in Session.php line 164
6. at Session::get('admin.id', null) in helper.php line 304
7. at session('admin.id') in Qiniu.php line 54
8. at Qiniu->uploadConfigInit(['cdnurl' => '', 'uploadurl' => 'ajax/upload', 'bucket' => 'local', ...], null) in Hook.php line 135
9. at Hook::exec('\addons\qiniu\Qiniu', 'upload_config_init', ['cdnurl' => '', 'uploadurl' => 'ajax/upload', 'bucket' => 'local', ...], null) in Hook.php line 94
10. at Hook::listen('upload_config_init', ['cdnurl' => '', 'uploadurl' => 'ajax/upload', 'bucket' => 'local', ...]) in Frontend.php line 95
11. at Frontend->_initialize() in Controller.php line 59
12. at Controller->__construct(object(Request))
13. at ReflectionClass->newInstanceArgs([object(Request)]) in App.php line 359
14. at App::invokeClass('app\index\controller...') in Loader.php line 479
15. at Loader::controller('index', 'controller', false, 'Error') in App.php line 580
16. at App::module(['', null, null], ['app_host' => '', 'app_debug' => true, 'app_trace' => false, ...], true) in App.php line 456
17. at App::exec(['type' => 'module', 'module' => ['', null, null]], ['app_host' => '', 'app_debug' => true, 'app_trace' => false, ...]) in App.php line 139
18. at App::run() in start.php line 19
19. at require('/www/wwwroot/school/...') in index.php line 25