Please do not bump closed request. The answer to your question has been given a month ago, check the follow up comments.

I have the same Issue.
What did you do to fix this ?


-- Unit tuleap.service has begun starting up.
Nov 20 16:05:17 satools.co.uk tuleap[3946]: PHP Fatal error: Uncaught Error: Class 'trackerPlugin' not found in /usr/share/tuleap/src/common/plugin/SerializedPluginProxy.php:113
Nov 20 16:05:17 satools.co.uk tuleap[3946]: Stack trace:
Nov 20 16:05:17 satools.co.uk tuleap[3946]: #0 /usr/share/tuleap/src/common/plugin/SerializedPluginProxy.php(99): Tuleap\Plugin\SerializedPluginProxy->instantiatePlugin('trackerPlugin', '2')
Nov 20 16:05:17 satools.co.uk tuleap[3946]: #1 /usr/share/tuleap/src/common/plugin/PluginLoader.php(62): Tuleap\Plugin\SerializedPluginProxy->getPlugin('2')
Nov 20 16:05:17 satools.co.uk tuleap[3946]: #2 /usr/share/tuleap/src/common/Event/EventManager.class.php(119): Tuleap\Plugin\PluginLoader->Tuleap\Plugin\{closure}('user_manager_ge...', Array)
Nov 20 16:05:17 satools.co.uk tuleap[3946]: #3 /usr/share/tuleap/src/common/Event/EventManager.class.php(107): EventManager->processEventOnListener('user_manager_ge...', Array, Array)
Nov 20 16:05:17 satools.co.uk tuleap[3946]: #4 /usr/share/tuleap/src/common/User/UserManager.class.php(198): EventManager->processEvent('user_manager_ge...', Array)
Nov 20 16:05:17 satools.co.uk tuleap[3946]: #5 /usr/share/tuleap/src/common/User/UserManager.class.php(465): UserManager->getUserInstanceFromRow(Array)
Nov 20 16:05:17 satools.co.uk tuleap[3946]: #6 /usr/share/tuleap/src/www/include/pre.php(172): UserManager->getCurrentUser()
Nov 20 16:05:17 satools.co.uk tuleap[3946]: #7 /usr/share/tuleap/src/utils/tulea in /usr/share/tuleap/src/common/plugin/SerializedPluginProxy.php on line 113
Nov 20 16:05:17 satools.co.uk systemd[1]: tuleap.service: main process exited, code=exited, status=255/n/a
Nov 20 16:05:17 satools.co.uk systemd[1]: Failed to start Tuleap service.
-- Subject: Unit tuleap.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit tuleap.service has failed.

Thank. Bug fixed!