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HP OfficeJet Pro 6978

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Dell Inspiron 15 laptop
Microsoft Windows 10 (32-bit)

I recently replaced my previous Dell laptop, with another Dell and am having problems printing envelopes on my HP OfficeJet Pro 6978.  I've entered the print criteria on the printer to print envelopes 4" x 9 3/8". After loading the envelope and clicking on envelope print, I receive the following: "The paper size detected by the printer does not match the paper size selected for the print job." Printing from the Internet, Word documents and Excel are all fine.

HP Support Agent
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