I noticed that you have asked the same question in a support ticket. I have answered there and will summarize my response also in this public thread for the benefit of our community :
The error message probably occurs because you use a string that is not a valid Assembly Qualified name for the report name. You need to use Assembly Qualified name for PDFSource.TypeName. The attached project demonstrates the following approach:
1. Create a report through the Visual Studio Report Designer.
2. Add a report parameter (VACId) from type Integer.
3. Display the report parameter's value in a textbox.
4. Add a new Console Application to the solution.
5. Add a reference to the Report Library.
6. Use the following piece of code to export the report and set a value for the parameter.
var reportProcessor = new Telerik.Reporting.Processing.ReportProcessor();
var deviceInfo = new System.Collections.Hashtable();
var reportSource = new Telerik.Reporting.TypeReportSource();
reportSource.TypeName = typeof(ReportLibrary2.rptVAC).AssemblyQualifiedName;
Telerik.Reporting.Processing.RenderingResult result = reportProcessor.RenderReport("PDF", reportSource, deviceInfo);
string fileName = result.DocumentName + "." + result.Extension;
string path = "../../Reports";
string filePath = System.IO.Path.Combine(path, fileName);
using (System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.FileMode.Create))
fs.Write(result.DocumentBytes, 0, result.DocumentBytes.Length);
Another reason for the error can be if you currently use version 188.8.131.528, but the report was created with an older version. This error is often seen when the report and assemblies are from different versions. The easiest way to ensure that all Reports and Assemblies are consistent in version and build would be to run the Upgrade Wizard. After running the Upgrade Wizard, restart Visual Studio and then you have to be able to run the report.
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