Go to Settings > Bluetooth & devices > Printers & scanners . Find your LBP6030. Click Print server properties . Go to the Drivers tab. If you see two entries (one V3, one V4), delete the V3 one. Then restart the print spooler service.
Click and ensure "Use Printer Offline" is unchecked in the Printer menu. Driver Signature Errors canon lbp6030 v4 driver link