there are several things that you need to check:
1. Have you installed the CrystalReportViewer on your system? If you have not, you better install it?
2. Have yuo referenced your code to the CrystalReport images? Usually, there must be a folder called crystalreportviewerXXX on your development folder and this folder contains the images necessary for your Crystal Report.
I used to have this problem before, but the support at my host, ASPHostCentral, fixed it. If you are looking for a place to host your Crystal Report project, I certainly recommend them to you :)
Hope this helps.