Unfortunately, Apple does not provide any kind of "Error List", so error 19......whatever that might be......is not going to tell us anything useful.
I assume that you have done the following a few times:
Powered off the Time Capsule
Restarted your Mac
Powered the Time Capsule back up
If not, that would be a good task to perform
It would also be worthwhile to try Verify Backups. To do that......
Hold down the option key on your Mac while you click on the Time Machine "clock" icon at the top of the Mac's screen
Select Verify Backups and run the process
If the process can run, it might take anywhere from 10-60 minuted for the check to complete
You can watch the progress by clicking on the Time Machine "clock" icon and then clicking on Open Time Machine Preferences
If the process cannot run, or errors are reported, unfortunately this would indicate that your backup file has become corrupted. In that case, all that you can do is erase the current backup file and try to start over again with a new backup.
Apple does not really mention that Time Machine backups to a Time Capsule became a lot more complicated, with more chances for errors when Big Sur was introduced. Monterey continues the tradition.