HTTP Status 404-No result defined for action xxx and result input

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Error Information:
HTTP Status 404 – Not Found
No result defined for action xxx and result input
org.apache.struts2.dispatcher.Dispatcher warn
WARNING: Could not find action or result: xxx

Error Cause:

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<!--When the form was posted, value="${customer.cid} " would be sent to the "customer.cid"-->
<td colspan="3">
  <!--customer.cid is defined as Integer-->
  <select name="customer.cid">
        <c:forEach var="customer" items="${list }">
  <!--here "{customer.cid} " has a wrong blank in the quotation, make value cannot match the variable in the customer-->
            <option value="${customer.cid} ">${customer.custName }</option>
        </c:forEach>
  </select>
</td>

Error Solution: Get rid of the blank in the value of the option label.