Ssrs localy its workin fine when publishing its not working

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C#

SSRS

in Report with Microsoft Report Viewer locally
It works fine, but when I publish it in webserver (any webserver, even localhost ii7.0), it dosen't work and show this error in report viewer:
in vs 2010
An error occurred during local report processing.
The definition of the report 'Main Report' is invalid.
The report definition is not valid.
Details: Data at the root level is invalid. Line 1, position 1.

What I have tried:

DataTable dt = new DataTable();
           //TalukApprove tlk = new TalukApprove();
           dt = GetData(instcode);
           rptinstitutewise.Reset();
           rptinstitutewise.ProcessingMode = ProcessingMode.Local;
           ReportDataSource DS = new ReportDataSource("Dsconsolidatedmanulstock", dt);
           rptinstitutewise.LocalReport.DataSources.Clear();
           ReportParameter[] parms = new ReportParameter[1];
           parms[0] = new ReportParameter("@instid", instcode);

           //this.ReportViewer1.ServerReport.SetParameters(parms);
           rptinstitutewise.ServerReport.Refresh();
           rptinstitutewise.LocalReport.DataSources.Add(DS);
           rptinstitutewise.LocalReport.ReportPath = Server.MapPath("~/Reports/Drugconsolidaterpt.rdlc");

           rptinstitutewise.LocalReport.Refresh();