This is regularly going to fail, you cannot chmod +x any file on MyDocs since MyDocs is a FAT fs.
~/MyDocs $ touch bla ~/MyDocs $ ls -l bla -rwxrwxrwx 1 user root 0 Aug 28 22:54 bla ~/MyDocs $ chmod +x bla ~/MyDocs $ ls -l bla -rwxrwxrwx 1 user root 0 Aug 28 22:54 bla ~/MyDocs $ chmod -x bla ~/MyDocs $ ls -l bla -rwxrwxrwx 1 user root 0 Aug 28 22:54 bla ~/MyDocs $