Problem with .rdlc Sub Report

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ASP.NET

RDLC

Hello All

I am using rdlc reports in my project. It was working fine.
But I am using sub report and it is working fine on my local server. But giving error on server.

An error has occurred during report processing.
    Exception has been thrown by the target of an invocation.
        A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)

My sub report don't contain any parameter and i am using following code to find subreport for report viewer

protected void Page_Load(object sender, EventArgs e)
   {
       this.ReportViewer1.LocalReport.EnableExternalImages = true;
       ReportViewer1.LocalReport.SubreportProcessing += new SubreportProcessingEventHandler(SetSubDataSource);
       this.ReportViewer1.LocalReport.Refresh();
   }
   public void SetSubDataSource(object sender, SubreportProcessingEventArgs e)
   {
       e.DataSources.Add(new ReportDataSource("TermsDataSet_TERMS", "ObjectDataSource3"));
   }

Can anyone please suggest me where the bug is?

Thanks in advance