Error - SWPDFSAVETODISK (29) : 53 - File not found

This type of error message is most probably linked to a runtime exception.

In order to resolve the error you will need to send the content of your Java Debug Console at the time the error occurs to SWING support team at 

You can open the Java Debug Console by selecting "Tools" -> "Show Java Debug Console" in Lotus Notes 8 or "File" -> "Tools" -> "Show Java Debug Console" in earlier versions. If you can't find the Java Debug Console in your menu, please see this article on how to get this menu to display in Notes.