Problem php

hi i’m trying to use icinga2 for my computer but when i go to the webpage i got this message:

Fatal error: Uncaught ErrorException: session_name(): Cannot change session name when session is active in /usr/share/php/Icinga/Web/Session/PhpSession.php:97 
Stack trace: 
#0 [internal function]: Icinga\Application\ApplicationBootstrap->Icinga\Application\{closure}(2, 'session_name():...', '/usr/share/php/...', 97, Array) 
#1 /usr/share/php/Icinga/Web/Session/PhpSession.php(97): session_name('Icingaweb2') 
#2 /usr/share/php/Icinga/Web/Session/PhpSession.php(152): Icinga\Web\Session\PhpSession->open() 
#3 /usr/share/php/Icinga/Web/Controller/ActionController.php(544): Icinga\Web\Session\PhpSession->write() 
#4 /usr/share/php/Icinga/Web/Controller/ActionController.php(489): Icinga\Web\Controller\ActionController->shutdownSession() 
#5 /usr/share/icingaweb2/library/vendor/Zend/Controller/Action.php(512): Icinga\Web\Controller\ActionController->postDispatch() 
#6 /usr/share/php/Icinga/Web/Controller/Dispatcher.php(76): Zend_Controller_Action->dispatch('errorAction') 
#7 /usr/share/icingaweb2/library/vendor/Zend/Controller/Front.php( in /usr/share/icingaweb2/library/vendor/Zend/Controller/Plugin/Broker.php on line 332

pls can someone explain me what is the problem or even if you have a solution.
Thanks

I made a quick edit on your Mardown for readablility.
Here is a guide that explains how that works for the future :slight_smile: