Index was out of range. Must be non-negative and less than...

[danielact]

I just went from NPrinting 16.3 to 16.6, and now my PowerPoint reports won't generate. I get an error stating "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"

When I rolled it back to 16.3, the reports work perfectly again.

Any ideas on why this is happening, and how to fix it?

[danielact · Accepted solution]

I figured out the issue behind the error. The user had requested that the PPT have the slides numbered 0,1,2,3. For some reason, version 16.6 doesn't like slide #0. Once I changed it to start with #1, it ran perfectly.