errors in file SegmentationforCortina ,m

 segmentation_ui( loaddir('I:\D\Datasets\Ncut_9\Ncut_9\jpg_images','*.jpg'), loadstrings('categ.txt') );

Error using fgets Invalid file identifier. Use fopen to generate a valid file identifier.

Error in fgetl (line 34) [tline,lt] = fgets(fid);

Error in loadstrings (line 21) tline = fgetl(fid);