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...', '/data/home/xyu299128...', 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('THINK_TOKEN') in aduons.php line 517
7. at create_think_token(1618557562.6127)
8. at call_user_func('create_think_token', 1618557562.6127) in Request.php line 1568
9. at Request->token('THINK_TOKEN', 'create_think_token') in aduons.php line 640
10. at include('/data/home/xyu299128...') in Config.php line 80
11. at Config::load('/data/home/xyu299128...', 'aduons') in App.php line 262
12. at App::init() in App.php line 182
13. at App::initCommon() in App.php line 82
14. at App::run() in start.php line 19
15. at require('/data/home/xyu299128...') in index.php line 41