Re: Unexplained crystal report error. No main panel object defined. Previewer cannot be created.
Robbert,
The error is given by the function PreviewObject and this function queries the property Main_Panel_Id. An object of the BasicPanel class (or one of its sub-classes such as Panel) return their object ID.
What I think you have is a modal panel object not nested within a PANEL or BASICPANEL object and then the solution would be to move the USE/INCLUDE to a place inside the PANEL/BASICPANEL object.
Since Crystal is obsolete and at least 10 years old the better solution is to look at DataFlex Reports.
Regards,
Data Access Worldwide
Vincent Oorsprong