Dear @falahfakhri,
this is a known error which occurs when there is a high density or amount of PS. Please have a look into the manual page of the Visualizer, there you can find a documented workaround to avoid the error.
You also have to be sure, that you user the right export script for your stamps version, since there have been changes in stamps v4.x… All this is also documented in the manual page within the application.
I hope that helps you.
Cheer