1. Uninstall your HP Printer Driver from the Root Level and then reinstall it
How to Uninstall HP Printer from Its Root Level and then Reinstall it
2. Create a New Admin Account before Uninstalling the Driver and Reinstalling the Driver
How to Create a New Admin Account
Read this: HP Printer Errors and Solution [Detailed] to learn how to solve other HP printer errors.
3. Do a System Restore – HP Printer Assistant Error Opening External Application
How to Perform System Restore
HP OfficeJet Pro 6978 All-in-One Wireless Printer, HP Instant Ink, Works with Alexa (T0F29A)
Main functions of this HP color inkjet photo printer: copy, scan, fax, wireless printing, two-sided duplex printing and scanning, color touchscreen, automatic document feeder, Instant Ink ready so youll never run out of ink, and more
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