Hi - Go ahead and try the following:
- First, validate that the paper size in the software you're printing from (i.e. MS Word, etc.) and the paper size in the printer driver (Go to Printers, right click on the 8710, and choose Printer Properties) are the same.
- Second, if that doesn't take care of it, change the paper type (normal, photo paper, matte photo paper, etc). I've had this resolve that type of problem before - even though the error references paper size.
Hope that helps.
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I am an HP employee.