error on serialization

hi guys

I am using Oracle Coherence as my distibuted cache

On a high level what i do is get a reference to the cache and set the values to it like:

 

import com.tangosol.net.NamedCache;   

public class StaffCacheLoad{

NamedCache namedCacheReference = CacheFactory.getCache("staffMap");//staffMap cache is defined in coherence	 

Map myMap = new HashMap<Staff>()

for (Staff obj : staffList) {
myMap.put(obj.getId(),obj.getDesc())
}

namedCacheReference.putAll(myMap);

..
}

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public class Staff implements Serializable{

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

id
desc

get()
set()

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now when the above process runs i get this error


Error during processing StaffCacheLoad(Wrapped) com.eway.model.Staff; local class incompatible: stream classdesc serialVersionUID = 4247448966215819804, local class serialVersionUID = 1
(Wrapped) java.io.InvalidClassException: com.eway.model.Staff; local class incompatible: stream classdesc serialVersionUID = 4247448966215819804, local class serialVersionUID = 1



trying to understand why i get this error
Any ideas will be appreciated

thanks