[rules-users] error while trying to put kbase in cache

[sdinoo]

I am trying to put kbase object into Grid
DurGridDAO dao = new DurGridDAO("durtest");
		Object o = dao.getVAlue("durKnowledgeBase1");
		System.out.println(o);
		// 
		if(o==null){
			System.out.println("Knowledgebase not found in cache kbase = " + o);
			o = readKnowledgeBase();
			System.out.println(o);
			dao.putVAlue("durKnowledgeBase1", o);// 
		}
		KnowledgeBase kbase = (KnowledgeBase)o;

Caused by: java.lang.ClassCastException: [B cannot be cast to
com.gemstone.gemfire.cache.Operation
	at
com.gemstone.gemfire.internal.cache.tier.sockets.command.Put65.cmdExecute(Put65.java:85)
	at
com.gemstone.gemfire.internal.cache.tier.sockets.BaseCommand.execute(BaseCommand.java:133)
	at
com.gemstone.gemfire.internal.cache.tier.sockets.ServerConnection.doNormalMsg(ServerConnection.java:758)
	at
com.gemstone.gemfire.internal.cache.tier.sockets.ServerConnection.doOneMessage(ServerConnection.java:879)
	at
com.gemstone.gemfire.internal.cache.tier.sockets.ServerConnection.run(ServerConnection.java:1103)

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