Error when parsing input XML elements - null - null

Error when parsing input XML elements - null - null

Hi,

I am trying to add/edit request using REST API from .net application.

I could able to Add/Edit requests by passing plain text in the description field.
but I have a requirement such as the Description field should receive an HTML content from the.net application, so it would render in the Service Desk application's description area.When I am trying to pass the HTML content in the description field I am getting following error
"Error when parsing input XML elements - null - null"
 
Request Is :

<operation><Details><parameter><name>requesttemplate</name><value>TestTemplate</value></parameter><parameter><name>requester</name><value>Kathiresan Palanivel : Musanada IT</value></parameter><parameter><name>subject</name><value>API Test Call</value></parameter><parameter><name>description</name><value>&lt;html&gt;&lt;body&gt;&lt;h1&gt;&nbsp;API&nbsp;TEst Call Description&lt;/h1&gt;&lt;/body&gt;&lt;/html&gt;</value></parameter><parameter><name>resolution</name><value>Closed By SharePoint Workflow</value></parameter></Details></operation>

 
Response Is: <operation name="EDIT_REQUEST"><result><status>Failed</status><message>Error when parsing input XML elements - null - null</message></result></operation>

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