Missing VIPROJ.PLN plugin

I am not sure if this is an Adobe supplied plugin, I was not able to find it on my computer. Probably you could try exporting your document to IDML and then resaving it as INDD, that would remove the missing plugin information from the document and you would be able to package it.

You can also use a plugin I created from the following link, it will remove the missing plugin information. You can use the plugin free for 7 days.

https://github.com/Manan-Joshi/inexutils

-Manan