I'm using crystal XI in my asp.net project. For viewing reports i'm using crystal reports web viewer and it is working fine when the report orientation is set to portrait.When it is comes to landscape mode, the (Refresh/Zoom/Export/Next Pg) functions of the viewer shows error as given below.
Also i cant get other exception on my code behind or even firebug. I'm using crystal reports run-time V13 under .NET framework 4.5.1
On a page change or refresh happen then the datasource accessed. It seems to be an issue with that. Could you check if you can Verify the database.
Go to Database > Verify DataSource