CR allows report export to various formats, like Word and PDF. Our customers don't want the CR viewing; they want just the Word/PDF export file, without opening the viewer. I tried to implement this logic as follows: CR viewer is part of our report from. I create the form, initialize CR viewer with the report (report definition, data source, connection, parameters etc). Instead of opening the form (ShowDialog), I call the viewer's export method.
This logic failed, with an error as 'Missing parameter values'.
If I open the form and execute the export, there is no error, export is generated.
So I tried opening the form outside the visible window; same error. I tried to open the form as minimized; same error again.
Last attempt was executing export from the Load event of the form. Interestingly, when opening the form the first time, I get the error. Any subsequent form opening works; the form is opened and show and the export is executed.

Obviously, parameter is not missing, as second time everything works. It seems the first activation and making the viewer visible does some initialization which are needed for export to succeed.

Does anyone has experience exporting (programmatically) from an invisible CR viewer?

/* BTW, the latest CR release includes a fix for a bug related to the message 'Missing parameter values'. Unfortunately that one is a different error, as the error occurs also with the latest release */

I want to create an exported file (.DOC or .PDF), saving it into a file. The methos export to file failed, if the viewer is not visible