0 - Failed to start the session because headers have already been sent by "/www/htdocs/w01bfb67/j4upgrade.copd-deutschland.de/libraries/vendor/joomla/uri/src/UriHelper.php" at line 36.

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Failed to start the session because headers have already been sent by "/www/htdocs/w01bfb67/j4upgrade.copd-deutschland.de/libraries/vendor/joomla/uri/src/UriHelper.php" at line 36.
/www/htdocs/w01bfb67/j4upgrade.copd-deutschland.de/libraries/vendor/joomla/session/src/Storage/NativeStorage.php:473

Call stack
#	Function	Location
1	()	JROOT/libraries/vendor/joomla/session/src/Storage/NativeStorage.php:473
2	Joomla\Session\Storage\NativeStorage->start()	JROOT/libraries/src/Session/Storage/JoomlaStorage.php:295
3	Joomla\CMS\Session\Storage\JoomlaStorage->start()	JROOT/libraries/vendor/joomla/session/src/Session.php:406
4	Joomla\Session\Session->start()	JROOT/libraries/vendor/joomla/session/src/Session.php:333
5	Joomla\Session\Session->has()	JROOT/libraries/src/Session/Session.php:191
6	Joomla\CMS\Session\Session->get()	JROOT/libraries/src/Factory.php:334
7	Joomla\CMS\Factory::getUser()	JROOT/libraries/src/Application/SiteApplication.php:552
8	Joomla\CMS\Application\SiteApplication->initialiseApp()	JROOT/libraries/src/Application/SiteApplication.php:218
9	Joomla\CMS\Application\SiteApplication->doExecute()	JROOT/libraries/src/Application/CMSApplication.php:294
10	Joomla\CMS\Application\CMSApplication->execute()	JROOT/includes/app.php:61
11	require_once()	JROOT/index.php:32