Why I am having load report failed issue?

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C#2.0

C#

ASP.NET

CrystalReports

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Why I am having load report failed issue in IIS 7.5? Cleared the temp file and also temporary asp.net files. Also folder permission given. Crystal Report Version is 10.2.3600.0
Binded as follows:ublic void ViewReport()
{

if (ddlCorporate.Items.Count == 1)
{
Common.showMessage("There is No Company", this.Page);
return;

}

bool validateDates = ValidationDate();
if (!validateDates)
{
Common.showMessage("From Date should be less than or equal to To Date", this);
return;
}
int startMonth = Convert.ToInt32(ddlFromMonth.SelectedValue);
int startYear = Convert.ToInt32(ddlFromYear.SelectedValue);
int endMonth = Convert.ToInt32(ddlToMonth.SelectedValue);
int endYear = Convert.ToInt32(ddlToYear.SelectedValue);


DateTime startDate;
DateTime endDate;
startDate = Convert.ToDateTime(startMonth.ToString() + "/01/" + startYear.ToString());
endDate = Convert.ToDateTime(endMonth.ToString() + "/01/" + endYear.ToString());

string reportPath = Server.MapPath("~//Reports//ActiveCardsMonthwiseSummary.rpt");
C3Report objC3Report = new C3Report();
string corporateId = ddlCorporate.SelectedItem.Value.Trim();

DataSet ds = objC3Report.GetMonthwiseActiveCardsSummary(corporateId, startDate, endDate, Session["ROLE"].ToString());
DataTable dt = ds.Tables[0];
if (dt.Rows.Count == 0)
{
Common.showMessage("No Record Found", this.Page);
return;
}
reportDocument = new ReportDocument();
reportDocument.Load(reportPath);
reportDocument.SetDataSource(dt);
CrystalReportCtrlSettings(CRVAllactiveCards);
CRVAllactiveCards.ReportSource = reportDocument;

//Set Parameter from "From"(month-year)
reportDocument.SetParameterValue(0, ddlFromMonth.SelectedItem.Text.ToUpper() + " " + startYear.ToString());
//Set Parameter from "To"(month-year)
reportDocument.SetParameterValue(1, ddlToMonth.SelectedItem.Text.ToUpper() + " " + endYear.ToString());

//Set Parameters based on Corporate dropdownlist Selection
if (ddlCorporate.SelectedIndex == 0)
{
reportDocument.SetParameterValue(2, "ALL CORPORATES");
}
else
{
reportDocument.SetParameterValue(2, ddlCorporate.SelectedItem.Text.ToUpper());
}


CRVAllactiveCards.DataBind();
Common.UserPageAudit(Session["User"].ToString(), "All Active Cards Monthwise Summary", Session["ROLE"].ToString(), "All Active Cards Monthwise Report Viewed");
}
Above method was called in page load with post back.