ColdFusion 6.1 restart every few minutes

Hi,
I am running ColdFusion MX 6.1, Win 2003, JVM 1.4.2-b28.
The issue is every few minutes the ColdFusion is restarting automatically when checked in the application events. The error description says : The coldfusion mx application server service killed process with pid. After this CF restarts.
The event ID is 263.
Any help  / suggestion is greatly appreciated.
Thank you.

Yes, I know it very well we have CF 10 now but I have to use CF 6.1 for now. If I check runtime logs it shows the below error :
Even there are other errors but the below error seems to be repeated many times.
java.lang.ClassCastException: isIISJrunVirtualDir
    at coldfusion.scheduling.PriorityComparator.compare(Scheduler.java:20)
    at org.apache.commons.collections.BinaryHeap.compare(Unknown Source)
    at org.apache.commons.collections.BinaryHeap.percolateUpMinHeap(Unknown Source)
    at org.apache.commons.collections.BinaryHeap.insert(Unknown Source)
    at coldfusion.scheduling.Scheduler.insert(Scheduler.java:109)
    at coldfusion.scheduling.Scheduler.schedule(Scheduler.java:195)
    at coldfusion.mail.MailSpooler.run(MailSpooler.java:924)
    at coldfusion.scheduling.ThreadPool.run(ThreadPool.java:201)
    at coldfusion.scheduling.WorkerThread.run(WorkerThread.java:70)
java.lang.ClassCastException: isIISJrunVirtualDir
    at coldfusion.scheduling.Scheduler.createRunnable(Scheduler.java:128)
    at coldfusion.scheduling.ThreadPool.createRunnable(ThreadPool.java:128)
    at coldfusion.scheduling.WorkerThread.run(WorkerThread.java:67)
java.lang.ClassCastException: isIISJrunVirtualDir
    at coldfusion.scheduling.Scheduler.createRunnable(Scheduler.java:128)
    at coldfusion.scheduling.ThreadPool.createRunnable(ThreadPool.java:128)
    at coldfusion.scheduling.WorkerThread.run(WorkerThread.java:67)
Thank you so much.

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