I've been getting this error message a lot in recent days and I really don't know why.

When I preview the report in Visual Studio, the report runs without error.

When I integrated the report to run within the application, I kept getting the following error message:

"The source of the report definition has not been specified"

Please help.

Thank you in advance.

It sounds like you didn't set the report path property ServerReport.ReportPath

I set the ServerReport.ReportPath to point to the server where my .RDL file is located.

Thank you.

Here is another example I can share to clearly explain my issue:

I have an existing report (Report_A) that runs perfectly within the application.  I copied this existing report (Report_A) RDL file to make a minor change such as changing the font size on the textbox1.

After I made the change, I re-copied the updated RDL file to an appropriate report location or server.  I tried to run the report (Report_A) and I got the error "The source of the report definition has not been specified".

I really don't understand why.

Thank you.

Hi GarinTiger,

Based on your error message, the issue might be caused by the wrong report bath, you can try these steps to configure the path again for remote module:

1. Please make sure you have specify the correct report server URL and report path:
   Adding and Configuring the ReportViewer Controls
2. If the report is an embedded resource in a separate assembly then ReportViewer may not be able to find it. You can load the resource yourself and call the reportViewer.LocalReport.LoadReportDefinition() method to supply the RDL to ReportViewer as a stream. You can also load the RDL from the file system by adding a build action to copy the RDL to the same folder as the .exe and then setting the LocalReport.ReportPath to the name of the RDL file.
   
   

Similar threads, you can click it to get a reference from here
The report definition for report 'xxx' has not been specified
the report definition has not been specified

If you still have any problem, please feel free to ask.

Regards,
Vic