That error usually means either a link name has an illegal character such as a slash in the file or folder name, or the link is locked, but it's possible you really do have some sort of phantom links. Try this: Remove minor corruption by exporting
Go back and look at your file names (and names of folders that contain the files).
I see two potential problems in the part of your links list that is showing.
One file ends in .jpg:2
Another one has a period in the body of the name, and another before the extension
Actually, I don't think either of those examples would be a problem. The :2 incites the page from a multipage PDF, I think, and I've never encountered a problem with dots in the filename, though I won't swear it's impossible.
More likely problem characters would be /\@#%$* or some other symbols -- safest to use only alphanumerics plus underscore or hyphen.