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A dialog box with the above error message appears when trying to create a PDF from an Excel worksheet. Unless resolved, this will be a deal breaker for me. Am running Excel from Office 365 on a PC that has Windows 10 as its Operating System. Excel now has the Nitro Plug-in and I've noticed that within the printer selection dialog box, Nitro Pro no longer appears (but is certainly in the menu ribbon along with '[File] [Home] [Insert] [Page] .... [View] [Developer] [Nitro Pro] ...'). Are there any readers who can assist? Happy to answer any Qs that will assist diagnose this problem. Thanks in advance,