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 with the simple text.but not with HTML data.
 
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 with the REST API ADD/Edit Request I am getting the error
"Error when parsing input XML elements - null - null"
 
If I pass plain text, Its working fine. I just got the seen in flidder
 
Request Input Data:
<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><html><body><h1>&nbsp;API&nbsp;TEst Call Description</h1></body></html></value></parameter><parameter><name>resolution</name><value>Closed By SharePoint Workflow</value></parameter></Details></operation>
 
Response
<operation name="ADD_REQUEST"><result><status>Failed</status><message>Error when parsing input XML elements - null - null</message></result></operation>
 

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