29/04/2025
CrystalReport Error " 'CrystalDecissions.Windows.Forms' already exists".
Scenario: This was error shown when I was trying to drag and drop CrystalReportViewer in WindowsForm.
The reason I was seeing this error was previously I tested crystal report long back. But now after formatting several times and updating Visual Studio to the latest version and installing CrystalReport software accordingly, I start getting this message. When I searched for solutions, some suggestions were that this might be compatibility issue. So reading carefully the error message I saw 'CrystalDecissions.Windows.Forms' already exists.
Solution: So I went to References and removed all the previous references related to CrystalReport and dragged CrystalReportViewer into the Windows Form. That's all the issue was resolved.