Warning (2) : Undefined array key "HTTP_ACCEPT_LANGUAGE" [in /var/www/virtual/ts-teacher-dev.itokchinese.com/src/Controller/AppController.php, line 144]
Warning (512) : Unable to emit headers. Headers sent in file=/var/www/virtual/ts-teacher-dev.itokchinese.com/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php line=37 [in /var/www/virtual/ts-teacher-dev.itokchinese.com/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 65]
Warning (2) : Cannot modify header information - headers already sent by (output started at /var/www/virtual/ts-teacher-dev.itokchinese.com/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:37) [in /var/www/virtual/ts-teacher-dev.itokchinese.com/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 159]
Warning (2) : Cannot modify header information - headers already sent by (output started at /var/www/virtual/ts-teacher-dev.itokchinese.com/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:37) [in /var/www/virtual/ts-teacher-dev.itokchinese.com/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 192]
Error: substr(): Argument #1 ($string) must be of type string, null given

substr(): Argument #1 ($string) must be of type string, null given 📋

TypeError
Error in: ROOT/src/Controller/AppController.php, line 144

Could this be caused by using Auto-Tables?

Some of the Table objects in your application were created by instantiating "Cake\ORM\Table" instead of any other specific subclass.

This could be the cause for this exception. Auto-Tables are created for you under the following circumstances:


Please try correcting the issue for the following table aliases:


APP/Controller/AppController.php at line 144 (edit)
        // lang settings
        $locale = $session->read('locale');
        if (empty($locale)) {
            $browser_lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 5);
            switch ($browser_lang) {
                case 'zh-HK':
                case 'zh-MO':
                case 'zh-TW':

If you want to customize this error message, create templates/Error/error500.php