Issue

When you start Adobe Photoshop CS5 (or CS4, CS3) on Mac OS, the program returns the following error message:

"One or more files in the Adobe Application Support folder, necessary for running Photoshop, are missing. Please run the Photoshop installer and re-install Photoshop."

Solution

If you ran an Archive And Install before this error occurred, and you have not deleted your archived System Folder, then do Solution 1. Otherwise, do Solution 2. (The archived System Folder is in /Library/Previous Systems.)

Solution 1: Copy Adobe Unit Types.osax from an archived ScriptingAdditions folder.

  1. Quit Photoshop.
  2. In the Finder, choose Go > Computer.
  3. Double-click the icon for your startup drive.
  4. Open the Previous Systems folder.
  5. Open the most recent of the folders that are inside the Previous Systems folder.
  6. Open the Library folder. (An archived Library folder, not the current Library folder.)

  7. Open the ScriptingAdditions folder.
  8. Inside the ScriptingAdditions folder, select Adobe Unit Types.osax.
  9. Choose Edit > Copy.
  10. Choose Go > Computer
  11. Double-click the icon for your startup drive.
  12. Open the Library folder. (This is the current Library folder.)
  13. Look for a ScriptingAdditions folder inside the Library folder. Then do one of the following:



    • If the ScriptingAdditions folder exists, then open the ScriptingAdditions folder.
    • If the ScriptingAdditions folder does not exist, then choose File > New Folder and name the new folder ScriptingAdditions (without a space). Then open this new ScriptingAdditions folder.
  14. Choose Edit > Paste. Adobe Unit Types.osax is restored in the correct location.

Solution 2: Restore Adobe Unit Types.osax by reinstalling Photoshop.

Photoshop CS5 or CS4

  1. Quit all Adobe applications.
  2. Do one of the following:

    • If you purchased Photoshop CS5 or CS4 or Creative Suite 5 or 4 as physical software, then insert your installation DVD-ROM into your computer's DVD drive.
    • If you downloaded Photoshop CS5 or CS4 or Adobe Creative Suite 5 or 4 from the Adobe Online Store, then double-click the disk image (.dmg) file or files that you downloaded.
  3. Double-click the file named Setup on your installation DVD-ROM or disk image.
  4. Select Adobe Photoshop in the Installed Products list.
  5. Click Install, and follow the on-screen instructions.

Photoshop CS3

  1. Quit all Adobe applications.
  2. Do one of the following:
    • If you purchased Photoshop CS3 or Adobe Creative Suite 3 as physical software, then insert your installation DVD-ROM into your computer's DVD drive.
    • If you downloaded Photoshop CS3 or Adobe Creative Suite 3 from the Adobe Online Store, then double-click the disk image (.dmg) file or files that you downloaded. (If you did not keep the disk image file or files after your original installation, then download them again. Sign in at www.adobe.com/membership, click View Order History, and find your order in the list.)
  3. Double-click the file named Setup on your installation DVD-ROM or disk image.
  4. Click Install Or Reinstall.
  5. Click Next.
  6. Do one of the following:
    • If you purchased Photoshop CS3 as a standalone product, then skip to Step 7.
    • If you have Photoshop CS3 as part of Adobe Creative Suite 3, then select Adobe Photoshop CS3 in the Select The Components You Want To Reinstall section. Deselect the other applications in this section. If any items appear in the Select Components You Want To Install section, then deselect them.
  7. Click Next.
  8. Click Install, and follow the on-screen instructions.

Additional information

This error indicates that a Photoshop support file -- Adobe Unit Types.osax -- is not in its expected location, /Library/ScriptingAdditions.

You are likely to see this error after you use the Archive And Install method to upgrade or reinstall Mac OS X. In an Archive And Install, the Mac OS X installer moves existing system files into a new folder and then writes new system files. This error occurs because the Mac OS X installer moves Adobe Unit Types.osax and does not re-create it.

You can see this error even if you did not perform an Archive And Install. For example, if you ran the uninstaller for a different version of Photoshop on the same computer.

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