Warning: Uncaught exception 'TYPO3\CMS\Core\Error\Exception' with message 'PHP Warning: require_once(/var/www/vhosts/typo3/public_html/typo3/sysext/cms/tslib/class.tslib_pibase.php): failed to open stream: No such file or directory in /var/www/vhosts/typo3/public_html/typo3conf/ext/kc_emailnotification/pi1/class.tx_kcemailnotification_pi1.php line 25' in /var/www/vhosts/typo3/typo3_src-6.2.13/typo3/sysext/core/Classes/Error/ErrorHandler.php:101 Stack trace: #0 /var/www/vhosts/typo3/public_html/typo3conf/ext/kc_emailnotification/pi1/class.tx_kcemailnotification_pi1.php(25): TYPO3\CMS\Core\Error\ErrorHandler->handleError(2, 'require_once(/v...', '/var/www/vhosts...', 25, Array) #1 /var/www/vhosts/typo3/public_html/typo3conf/ext/kc_emailnotification/pi1/class.tx_kcemailnotification_pi1.php(25): require_once() #2 /var/www/vhosts/typo3/typo3_src-6.2.13/typo3/sysext/frontend/Classes/Controller/TypoScriptFrontendController.php(4469): include_once('/var/www/vhosts...') #3 /var/www/vhosts/typo3/typo3_src-6.2.13/typo3/sysext/fr in /var/www/vhosts/typo3/typo3_src-6.2.13/typo3/sysext/core/Classes/Error/ErrorHandler.php on line 101

Fatal error: main(): Failed opening required '/var/www/vhosts/typo3/public_html/typo3/sysext/cms/tslib/class.tslib_pibase.php' (include_path='/var/www/vhosts/typo3/public_html/typo3/contrib/pear/:.:/usr/share/pear:/usr/share/php') in /var/www/vhosts/typo3/public_html/typo3conf/ext/kc_emailnotification/pi1/class.tx_kcemailnotification_pi1.php on line 25