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rushi ettam 7rushi ettam 7 

Error in setting the query string parameter

Hello,
  This is a vf page, trying to get &set the  query string parameter
The page compiled successfully and showing the list of related contacts but when I click the contact name link the following error occurs
Insufficient Privileges
You do not have the level of access necessary to perform the operation you requested. Please contact the owner of the record or your administrator if access is necessary. For more information, seeInsufficient Privileges Errors. 

<apex:page standardController="account">
  <apex:form >
   <apex:pageBlock title="contacts" >
    <apex:pageBlockTable value="{!account.contacts}" var="ca">
     <apex:column headerValue="Name" >
      <apex:commandLink > {! ca.name}
       <apex:param name="cid" value="{ca.id}"/>
       </apex:commandLink>
       </apex:column>
      <apex:column value="{!ca.email}"/>
    </apex:pageBlockTable>
   </apex:pageBlock>
   <apex:detail subject="{!$CurrentPage.parameters.cid}" relatedList="false"/>
  </apex:form>
</apex:page>

Anyboby have solution for this problem???????