Unable to resolve type 'GrapeCity.ActiveReports.Viewer.Wpf.Viewer'
You receive this error when your licenses.licx file contains entries you don't need. Only include the entries you need in the licenses.licx file.
Steps to Complete:
1. Open the licenses.licx file in that project
2. Remove the GrapeCity.ActiveReports.Viewer.Wpf.Viewer, GrapeCity.ActiveReports.Viewer.Wpf from the file
3. Rebuild/Run the application for the error to go away
Note: For a list of all the entries ( also known as required references) you may need for your licenses.licx file, please refer to this section in the link below: