Forum Post: Error Message when printing sales order invoice : "Unable to print so_invoice3.rpt. The system could not find the environment option that was entered"

WHen trying to print a sales order invoice from the sales order module i get the error message below. We do batch postings on a daily basis & this is the 1st time i have seen this. We are currently on version Sage 2013 (version 5.00.4.0). How do i fix this? It's month end and i'm trying to close the books.