The application requires that Assembly Microsoft.ReportViewer.ProcessingObjecModel Version 9.0.0.0 b

Today, my users encounterred an issue, that's the application requires that Assembly Microsoft.ReportViewer.ProcessingObjecModel Version 9.0.0.0 be installed in the Global Assembly Cache (GAC) first, after I published system. I used reportviewer in this modification. Per experience, I changed all the relative application files in project properties. But the issue still existed.
Per information from Internet, I downloaded ReportViewer.exe from here and let users install it. Great! It's workable.

Issue's snapshot FYR.