Line 93 of matsave load the just saved matlab structure but this command on line 93 fails if the current folder contains a space in its name. It happens in my case because my entire working directory is within the directory called "/Box Sync/" which is setup by the software "Box", something similar to Dropbox.
I actually have a symbolic link for "/Box Sync/" which has no space but the pwd command of Matlab returns the target, not the name of the link.