^ null

An exception occurred: [ErrorException] [E_WARNING] Cannot modify header information - headers already sent by (output started at /home/tarihiresim/public_html/src/vendor/symfony/var-dumper/Dumper/AbstractDumper.php:174) in src/XF/Http/Response.php on line 397

1. XF::handlePhpError()
2. header() in src/XF/Http/Response.php at line 397
3. XF\Http\Response->sendHeaders() in src/XF/Http/Response.php at line 289
4. XF\Http\Response->send() in src/XF.php at line 583
5. XF::runApp() in index.php at line 20