Why are you trying to write to the Applications folder and not Documents or the Temporary path??
Have you tried changing the path to see if it works?? What is the path you are using??
Seems like he is trying to keep the files included in the application bundle.
Have you tried simply setting the permissions for the folder you are trying to write to?
Might be a longshot, make sure the file isn't opened on the computer. I have had that happen from time to time
Unfortunately those suggestions have been tried to no avail.
'Bigtom' is correct about keeping the files bundled.
This application is deployed to some 20 different Mac users. Only one is experiencing the problem. They are the only user that I am sure is using El Capitan.
Could there be a problem with FileMaker 13 on El Capitan?
I'm having the same problem with a file hosted with FMS14 and El Capitan. it happens when I try to execute a Import Records script step. I get error 100 (File Not Found) and a legend like yours.
It has happened to me in two different setups with El Capitan and i wonder why nobody else has had this problem.