Fullfile function not reading files

fullfile not reading files in MacOs... Showing cannot find files or folders matching:

[dpb]

We can't see enough from clipped images to tell...but, the path or the specific file(s) looked for must not be there or the filenames are misspelled or somesuch.

Again, attach actual code/text, not images -- and get everything without clipping it...that very last '*' in the wildcard definition may be the significant point.