These are the main causes of the error message "HP Envy 6000 Printer Offline."
Your HP Smart App may not have been set up. Your printer may instead not be properly connected to WiFi. Alternatively, an outdated driver or a change in the printer's IP address could be to blame for this issue.
An additional factor could be that the printer's default settings are not being used, or that the printer's firmware needs to be updated. Finally, if there are unfinished tasks in the printing queue, this problem may arise.