At some point the VLM cart was reset without refilling it. This caused it to run dry.
Now you have air in your system and you most likely have air in your ink outlet on the cartridge. Wells is sending you a priming tip so you can re-prime your cartridge. This is the first thing to do before running and initial fill sequence.
A note. Printing with air in a line can burn out the nozzle on a head. This may have happened with your printer, but it does not always happen so it’s useful to try and get the ink back through the line.
After priming the cartridge, top off all your other carts and reset them. Make sure your maintenance tanks are also reset. (The initial fill will not work if any cartridge or maintenance tank is reading less than 1/2.)
Double check that you have primed your cartridge and then run the initial fill sequence for this printer. During the initial fill, keep an eye on your ink lines (flashlight will do). At one point you should see the VLM shoot through. If it doesn’t this means more serious damage occurred such as a problem with the ink dampers “air blocking” or damage to the print-head itself during the printing of a blacked channel.