the operation could not be completed (com.apple.imagecapture error 4294957375) (9921)

iMac running Catalina. This fixed it for me. I first deleted the printer and the Canon utility. Then I downloaded the latest Catalina update and the latest Canon driver (make sure to download scan utility as well). Re-added printer and was able to scan.

I spent some time with Apple support on this issue. I have a Canon printer.

What worked was installing the "optional" driver rather than the "recommended" driver. The optional driver is larger and includes scanner drivers. I had to delete the old drivers first, of course.

For my Cannon MF4770n, I went to Cannon's product support page (search it on Google) and downloaded the Optional (not the Recommended!) Driver, then install the new driver to my iMac and now it's working!! I didn't try it with the Recommended; it might work since it's a newly published (7/1/2020) driver, but I didn't want to take a chance since the last person said it didn't work so I downloaded the Optional instead. Apple's phone support was not helpful and it took forever to get someone on the phone to help. Hope this is helpful!

When I switched the settings from "Scan Color Document" to "Document with Text" for some reason it started working.

I had the same problem. This solved it: 1) Turn off printer, 2) Turn off Mac, 3) Turn on Mac, 3) Turn on printer.

Scanning and printing restored.

Had to remove my scanner from the list and set it up again, but it seems to be working now.

Hi guys, I do have the same problem with an HP MFW277. The interesting thing is, that this occurs only, when I connect via WiFi to the printer. (whether it is a MacBook (2016) or a MacBook Pro (2015). The printer is connected via LAN. As long i use the scanner from my wired iMAC it works.

I thought this could be something within the router but seems to be not.

I analysed the Network settings but was not able to find any difference between iMac and MacBook.

Perhaps this rings a bell to anybody of you.

I have the same question... Scanning is working on one iMac and not the Other .... Both are running Catalina....

Hi. I have IMac and iOS 10.15. But my canon scan is not working on it.

URL for drivers?

thanks - what's the URL for the new driver?

I can't scan my documents this error pops up all the time

com.apple.imagecapture error 4294957375) (9921)

Hi - can you point me to the new drivers plz?

Does anyone have an answer to the question?

Nothing is working, not even getting your answers - no links coming up to fix problem - Catalina is a mess! :(