I'm trying to use the method convertLead and here is the sample request i'm formulating:

  https://crm.zoho.com/crm/private/xml/Leads/convertLead?authtoken=f6b7ed13e8e1c3550666553cde1dd8bf&scope=crmapi&newFormat=2&id=618049000004139097&xmlData=<Potentials><row no="1"><option val="createPotential">true</option><option val="assignTo">crm@edureka.in</option><option val="notifyLeadOwner">true</option><option val="notifyNewEntityOwner">true</option></row><row no="2"><FL val="Closing Date"><![CDATA[2014-05-01]]></FL><FL val="Potential Stage"><![CDATA[Interested]]></FL><FL val="Amount"><![CDATA[1]]></FL><FL val="Probability"><![CDATA[50]]></FL><FL val="System Generated Activity"><![CDATA[Lead converted To Potential By System]]></FL><FL val="System Converted"><![CDATA[Yes]]></FL></row></Potentials>

RESPONSE :

Array

(

 [@attributes] => Array  (  [uri] => /crm/private/xml/Leads/convertLead  )   [error] => Array  (  [code] => 4500  [message] => Problem occured while processing the request  )   [status] => failure )

 Can someone please guide me through the process ,if i'm making any mistake here.

regards,

Hemant Singh