What computer system are you using?
Windows 8.1 system
Edit >> Preferences >> External editing (tab)
Under Additional External Editor click the “Choose” button.
Then navigate to:
C:\Program Files\Adobe\Adobe Photoshop Elements 13
Select the Elements 13 Editor (the application exe file)
I still get an error "cant write file" when exporting to PSE. I have
changed all permissions on both software.