Access the default Preferences file located at:
/Users/[user name]/Library/Preferences/Adobe Photoshop Elements 17 Settings
When you launch Photoshop Elements Editor on a Mac machine, you receive the following error message:
Could not complete your request because the scratch disks are full
There is not enough space available on your scratch or startup disk to launch Photoshop Elements Editor.
Remove some files from your disk to have at least 5 GB of disk space available on the scratch or startup disk.
Access the default Preferences file located at:
/Users/[user name]/Library/Preferences/Adobe Photoshop Elements 17 Settings
Rename the Preferences file by suffixing _old to the filename. The renamed Preferences file will be:
/Users/[user name]/Library/Preferences/Adobe Photoshop Elements 17 Settings_old
(Optional) Delete some files from the disk to have at least 5 GB of free disk space.
Restart Photoshop Elements.