svn集成后，svn同步任务不自动执行已解决悬赏5积分

按照这个方法验证了一下 还是不好用，看了一下log，计划任务出现异常，能再帮忙看看原因吗

09:44:04 Uncaught RuntimeException: Impossible CRON expression in lib\crontab\crontab.class.php:313
Stack trace:
#0 lib\crontab\crontab.class.php(149): CronExpression->getRunDate('now', 0, false, false)
#1 module\cron\model.php(65): CronExpression->getNextRunDate()
#2 module\cron\control.php(153): cronModel->parseCron(Array)
#3 framework\base\router.class.php(1703): cron->ajaxExec('0')
#4 www\index.php(68): baseRouter->loadModule()
#5 {main}
thrown in lib\crontab\crontab.class.php on line 313 when visiting cron-ajaxExec-0

09:44:44 Uncaught RuntimeException: Impossible CRON expression in lib\crontab\crontab.class.php:313
Stack trace:
#0 lib\crontab\crontab.class.php(149): CronExpression->getRunDate('now', 0, false, false)
#1 module\cron\model.php(65): CronExpression->getNextRunDate()
#2 module\cron\control.php(153): cronModel->parseCron(Array)
#3 framework\base\router.class.php(1703): cron->ajaxExec('0')
#4 www\index.php(68): baseRouter->loadModule()
#5 {main}
thrown in lib\crontab\crontab.class.php on line 313 when visiting cron-ajaxExec-0

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