upgrade to elgg 3.3.3

Hi !! comunnity !! I try to install elgg 2.7.11 but I never cant resolve the main problem that appear in my instalation procces, due that I install the last version but wend I run the install.php proces installation I have another error, someone knows about the next error message !

Warning: session_start(): Failed to read session data: user (path: /var/cpanel/php/sessions/ea-php72) in /home/digitum/public_html/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php on line 154

Fatal error: Uncaught RuntimeException: Failed to start the session because headers have already been sent by "/home/digitum/public_html/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php" at line 154. in /home/digitum/public_html/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:150 Stack trace: #0 /home/digitum/public_html/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php(323): Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start() #1 /home/digitum/public_html/vendor/symfony/http-foundation/Session/Session.php(256): Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->getBag('attributes') #2 /home/digitum/public_html/vendor/symfony/http-foundation/Session/Session.php(280): Symfony\Component\HttpFoundation\Session\Session->getBag('attributes') #3 /home/digitum/public_html/vendor/symfony/http-foundation/Session/Session.php(73): Symfony\Component\HttpFoundation\Session\Session->getAttributeBag() #4 /home/digitum/publi in /home/digitum/public_html/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php on line 150

Thanks in advance for your help

Hector