My guess is that you’ve got a corrupt TIFF file, or at least one that the library Autopsy uses can’t handle. It appears libtiff is very strict.
https://www.mathworks.com/matlabcentral/answers/99365-why-do-i-receive-a-null-count-for-tag-reading-a-tiff-file-using-imread-in-matlab-r2013a
Did ingest complete successfully apart from these pop-up warnings?
I’m not sure it’ll tell us much, but you could you attach your Autopsy logs, or just the stack traces. You can find the logs by going to Help->Open Log Folder in Autopsy. I don’t think there’s really a problem here, though, except that you’re seeing a message that should have only appeared in the logs.