[TYPO3-english] cal extension

[polycarp royal]

Hi people,

Have just updated my typo3 calendar_base extension and my typo3 backend and frontend disappeared. This is the error I get from the log file.

HP Fatal error:  require_once(): Failed opening required '/var/www/html/typo3conf/ext/cal/res/class.tx_cal_isCalNotAllowedToBeCached.php' (include_path='/var/www/html/typo3/contrib/pear/:.:/usr/share/pear:/usr/share/php') in /var/www/html/typo3temp/Cache/Code/cache_core/ext_localconf_6068a12d352941d6e5ee7dd31447d561068faea3.php on line 3617


 What do I need to do to clear this error and get my typo3 back?