Hi Kalor,
This error probably means that no pages were in the pdf produced by Image, in which case you will get an error, rather than an empty pdf. There could be many reasons, such as invalid data, all pages having conditions and all of them being false, etc...
To troubleshoot this, right before your Image ourput, insert a branch, and save a backup of the current data right before it makes it to Image. Then, when you get the error, open the PlanetPress document in Design, then load the data file that caused the error, and try to see if there's anything wrong with it. Maybe it's invalid, maybe it's causing page conditions to be false, etc...
Let us know how it goes!
Regards,
Raphaël Lalonde Lefebvre