jibx compile error

Experts, I have been encountering this error and don't have any idea on it, could anyone give me a clue? Thanks!!!

[jibx-bind] Using the following binding paths:
[jibx-bind]   src/jibx-saApp-GetEvaluatedAppraisalRecordsManager-binding.xml
[jibx-bind] Running binding compiler version jibx_1_1_6a
[jibx-bind] Warning: Undefined attribute usage; on mapping element at (line 7, col 199, in src/jibx-saApp-GetEvaluatedAppraisalRecordsManager-binding.xml)
[jibx-bind] Error running binding compiler
[jibx-bind]
[jibx-bind] *** Error during code generation for file 'src/jibx-saApp-GetEvaluatedAppraisalRecordsManager-binding.xml' - please enter a bug report for this error in Jira if the problem is not listed as fixed on the online status page ***
[jibx-bind] org.jibx.runtime.JiBXException: One or more <mapping> elements for modifiable classes must be defined in <binding>

public class E1Message {
	
	private String message;//message
	private String messagePrefix;//messagePrefix
	
	public String getMessage() {
		return message;
	}
	public void setMessage(String message) {
		this.message = message;
	}
	public String getMessagePrefix() {
		return messagePrefix;
	}
	public void setMessagePrefix(String messagePrefix) {
		this.messagePrefix = messagePrefix;
	}
}


import java.io.Serializable;
import java.util.ArrayList;

public class E1MessageList implements Serializable{
	
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private ArrayList<E1Message> e1Message;
	
	public ArrayList<E1Message> getE1Message() {
		return e1Message;
	}
	public void setE1Message(ArrayList<E1Message> message) {
		e1Message = message;
	}
}


public class GetEvaluatedAppraisalRecordsResponseListObj implements Serializable{
	
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private ArrayList<E1Message> e1MessageList;
	private ArrayList<GetEvaluatedAppraisalRecordsResponseObj> getEvaluatedAppraisalRecordsResponseObjs;
	public ArrayList<E1Message> getE1MessageList() {
		return e1MessageList;
	}
	public void setE1MessageList(ArrayList<E1Message> messageList) {
		e1MessageList = messageList;
	}
	public ArrayList<GetEvaluatedAppraisalRecordsResponseObj> getGetEvaluatedAppraisalRecordsResponseObjs() {
		return getEvaluatedAppraisalRecordsResponseObjs;
	}
	public void setGetEvaluatedAppraisalRecordsResponseObjs(
			ArrayList<GetEvaluatedAppraisalRecordsResponseObj> getEvaluatedAppraisalRecordsResponseObjs) {
		this.getEvaluatedAppraisalRecordsResponseObjs = getEvaluatedAppraisalRecordsResponseObjs;
	}

}


public class GetEvaluatedAppraisalRecordsResponseObj {
	
	private String jobNo;
	private String seqNo;

	public String getJobNo() {
		return jobNo;
	}

	public void setJobNo(String jobNo) {
		this.jobNo = jobNo;
	}

	public String getSeqNo() {
		return seqNo;
	}

	public void setSeqNo(String seqNo) {
		this.seqNo = seqNo;
	}

	public GetEvaluatedAppraisalRecordsResponseObj() {
		
	}

}



<binding>
	<mapping name="getEvaluatedAppraisalRecordsElement" class="com.gammon.ap.integration.ws.sa.GetEvaluatedAppraisalRecordsManager.GetEvaluatedAppraisalRecordsRequestObj" flexible="true" ordered="false">
		<namespace uri="http://oracle.e1.bssv.JP58P004/types/" default="elements"/>		
		<value name="everestEventPoint04" field="status" nillable="true"/>
	</mapping>
	
	<mapping name="getEvaluatedAppraisalRecordsResponseElement" class="com.gammon.ap.integration.ws.sa.GetEvaluatedAppraisalRecordsManager.GetEvaluatedAppraisalRecordsResponseListObj" usage="optional">
		<namespace uri="http://oracle.e1.bssv.JP58P004/types/" default="elements"/>
		<collection name="e1MessageList" field="e1MessageList"/>
		<collection field="getEvaluatedAppraisalRecordsResponseObjs" item-type="com.gammon.ap.integration.ws.sa.GetEvaluatedAppraisalRecordsManager.GetEvaluatedAppraisalRecordsResponseObj"/>
	</mapping>
	
	<mapping name="evaluatedRecordList" class="com.gammon.ap.integration.ws.sa.GetEvaluatedAppraisalRecordsManager.GetEvaluatedAppraisalRecordsResponseObj" flexible="true" ordered="false">
		<namespace uri="http://oracle.e1.bssv.JP58P004/types/" default="elements"/>		
		<value name="costCenter" field="jobNo" nillable="true"/>
		<value name="sequenceNumber" field="seqNo" nillable="true"/>
	</mapping>

	<mapping name="e1Messages" class="com.gammon.ap.integration.ws.sa.GetEvaluatedAppraisalRecordsManager.E1Message" ordered="false" flexible="true">
		<namespace uri="http://oracle.e1.bssv.JP58P004/types/" default="elements"/>
		<value name="message" field="message" nillable="true"/>
		<value name="messagePrefix" field="messagePrefix" nillable="true"/>
	</mapping>
</binding>

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