Accessing External Data from SharePoint 2010

I want to access external data from my SharePoint site.
I'm told that I need to follow these two articles.
http://msdn.microsoft.com/en-us/library/ff953161.aspx
http://msdn.microsoft.com/en-us/library/ff625800.aspx
I followed the first article but I get this error when I open the external list in my SharePoint site:
"Unable to display this Web Part. To troubleshoot the problem, open this Web page in a Microsoft SharePoint Foundation-compatible HTML editor such as Microsoft SharePoint Designer. If the problem persists, contact your Web server administrator."
I don't know how to write a custom code
BTW I have installed PowerPivot on my SharePoint server.
Can someone please help me? I need to do this very quickly.

Hi,
Can you please elaborate whether the data you are getting is from excel file or from database.
1. If you are populating it from excel , then you can use the Excel service, Power pivot etc mechanism.
2. If you are getting it from SQL database then you can use BCS service application and use the OOTB external list and content type to display the same in your home page.
Links of artcles are given below.
http://www.concurrency.com/blog/accessing-external-data-using-business-connectivity-services-in-sharepoint-2010/
http://msdn.microsoft.com/en-us/library/ff677562(v=office.14).aspx
Hope this will help.
Thanks and Regards, -- Santanu Kumar Choudhury ----- SharePoint 2007/10/13 Developer

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