500 Internal server error on Export to Excel

Hello All,
I have implemented Export to Excel using this tutorial:
http://wiki.sdn.sap.com/wiki/display/Snippets/WebDynproJava-ExportingTableDataUsingOn-DemandStreams-SAPNW+7.0
However, after deploying the application, it simply throws 500 internal server error. I have followed each step carefully but I guess something is missing or I am doing it wrongly. How should I go about resovling this issue? I have been trying to fix this since yesterday and yet no success.
As it is failing right after the deployment that means doInit() method of my view is not able to execute the method mentioned below:
wdThis.wdGetExportExcelCompInterface().initialize(wdContext.nodeVn_OutputTable(), getColumnInfos());
I have defined getColumnInfos() method in the view but not sure why it is failing? Any thoughts on this? Has anyone implemented this? If not, please direct me to some simple export to excel code snippet or document. I have been struggling to implement simple Export to Excel on table. (I am not using RFC. The data is coming from KM APIs)
Ameya

Dear Ameya,
For Comunication between DC's, you should use the other DC's as Used Webdypro Component. If you are using with different scenario with webdynpro reference, then please have a look at below document might help to resolve your issue.
http://help.sap.com/saphelp_nw70/helpdata/en/42/9ddf20bb211d72e10000000a1553f6/content.htm
Adding a WebDynpro DC as used Component to a portal app
Using Development Components in WebDynpro components - runtime failures
Best Regards
Arun Jaiswal

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