The deleted metadata I cannot decode, but that message is one that is from Dropbox API, as I found mentions when I searched for that phrase.
Since you had me do that, I figured out the problem. The symbol ␆ (ACK) is converted to hex at \x06. Since that is not what is actually there, the decode doesn't match, hence the error. The ack is part of a filename that I have for indexing for each listing, with tens of thousands of instances of that filename - causing the display of the errors.