Hi Bernard,
Is this happening when you run the report on the development machine? Can you open a report in the report designer and run it?
What version of Crystal Reports are you using? If you are using Crystal Reports for Visual Studio, have you upgraded to the Crystal Reports for Visual Studio 2012 version?
Make sure your project's Target Framework is set to use .NET Framework and not .NET Framework Client Profile.
If you are using CRforVS, make sure you have installed 32 and 64 bit runtime on the Development machine. Even though Crystal is 32 bit, it will use 64 bit runtime if your application compiles to 64 bit.
Good luck,
Brian