"There was an error opening this document. This file cannot be found."

I have a bunch of files that I can see on my local computer in the iCloud folder. They have a cloud icon next to the name. When I try to open them, I get the message "There was an error opening this document. This file cannot be found." When I check the info of the files, the size is non-zero but the size on disk is zero bytes. When I check iCloud in my browser, I see that the files are not there.

I am not sure what has gone wrong here. Any help is appreciated. Thank you!