Links Error
I have 2 InDesign files that won't allow me to package them. The error message I get is below. 
I have troubleshooted every solution I can come across and nothing is working.
- I checked all the file names and there are not un-allowed characters in any of them. Some have an underscore but no slashes and no periods.
- I tried to select all the link, go to Utilities and "Copy Link To."
- I've checked the URLs and they all work.
One theory I read was that path name of the linked images could be too long. HOW DO I KNOW WHAT TOO LONG IS???
I am able to export the file to PDF, but it will NOT allow me to package the file with fonts and links.
I cannot figure this out and it's driving me crazy!