Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
That is a severe error, and sometimes happens after a paper jam, or after use of defective/second-rate/knockoff ink cartridges.
Examine the interior of the printer. Remove any debris found. Paper, scraps, fluff, loose parts fallen off their mountings, paperclips, etc... remove any and all of those.
Fold a paper towel over four times, remove the cartridges one by one without touching their copper-colored contacts nor their inky undersides, and place them on their sides on the folded paper towel.
Turn the printer Off for 4 to 8 minutes, unplugged from the power.
Close the printer's covers etc. over the empty cartridges, as if they were there and as if for normal operation.
After that interval (not too long lest the cartridges dry out) turn the printer On, and wait for it to initialize, and show an error message. Then put in one ink cartridge only, close up the printer again, and wait again for the printer to either show an error B200 (or other) again, or to complain about missing cartridge(s).... and put the next cartridge, one only, in the printer, close up, wait, etc.... until either one cartridge added brings up the B200 error again, or until (amazingly, in some cases) the B200 error does not come up and this all gets the printer working again.
If that does not improve matters at all, then tell me more - what cartridges you are using, whether they are Canon OEM original or not, how old the printer is, what cartridge was replaced recently, whether the printer suffered a paper jam or other notable event before this error occurred, etc., and I will advise you further as to what to do.
Let me know. Thanks.