You’ve a visual studio 2012 or 2013 web application project that uses report viewer control with local mode reports (RDLC).
You’ve created the RDLC report and the report path has been chosen from the Report Viewer web control as shown below.
Under these circumstances, when you run the project from Visual studio, you get the following error message.
To mitigate this problem, go to the properties page of the Report viewer (Not the properties dialog box) as shown below and locate the LocalReport property.
Expand the property and in the ReportPath specify just the name of the report. It is case sensitive. In our case it is: Report3.rdlc
Please note: If the report is stored with in any folder, make sure the folder names are included with the report name.
For e.g: If the report is with in Reports folder then, Reports/Report3.rdlc
Save the project and run it. Your report should appear fine as expected.
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the answer is very helpful for me.