When you start Lightroom, change modules, or perform other functions, you get an error message

  • Error changing modules.
  • Error switching modules.
  • An error occurred when attempting to change modules.

Solutions

Try the following solutions, in order. After performing each solution, test to see if the issue recurs.

Solution 1: Install the current Lightroom update.

In Lightroom, choose Help > Check For Updates, or go to Lightroom for Mac OS or Lightroom for Windows on the Adobe website.

Solution 2: Re-create the preference file.

Solution 3: Reinstall Lightroom

Uninstall and then install Lightroom again. 

For Lightroom CC, see: 

For Lightroom 6 or earlier, see:
Install Lightroom from your original installation media. For Lightroom 5 or earlier you may download and install the most up to date version of Lightroom directly:

Solution 4: Create a different catalog.

To determine whether the problem lies with the catalog you’re using, import some images into a new catalog and then restart Lightroom.

Solution 5: (Lightroom 3) Uninstall Nik Software plug-ins.

Uninstall any Nik Software plug-ins you have installed, including Photoshop plug-ins, and then restart Lightroom. If Lightroom starts, make sure that you're using the most recent version of the Nik plug-ins. For help uninstalling Nik plug-ins, visit Nik Software Support.

Solution 6: Set correct permissions on Lightroom folder inside Application Support.

Note: Use this solution if you are asked for your serial number after you relaunch Lightroom after getting this error.

The Lightroom folder inside Application Support could have the wrong permissions preventing Lightroom from writing to it, which can cause this error. 

  • Navigate to the following folder: /Users/[user name]/Library/Application Support/Adobe/Lightroom.
  • Highlight the Lightroom folder and chose File > Get Information.
  • Under Sharing & Permission, verify that you have Read & Write Privileges. If not, click the padlock icon at the lower right, enter your password when prompted, then click the Read only entry and select Read & Write.

Important: (Mac OS) Apple made the user library folder hidden by default with the release of Mac OS X 10.7. If you need access to files in the hidden library folder to perform Adobe-related troubleshooting, see How to access hidden user library files.

Solution 7: Try a different user account.

Copy the Lightroom folder into a new user account or other existing account on your computer. Then, restart Lightroom. The Lightroom folder is in the following locations:

  • Windows XP: C:\Documents and Settings\[user name]\Application Data\Adobe\
  • Windows 7, Vista: [user name]\AppData\Roaming\Adobe\
  • Mac OS: [user name]/Library/Application Support/Adobe/

Important: (Mac OS) Apple made the user library folder hidden by default with the release of Mac OS X 10.7. If you need access to files in the hidden library folder to perform Adobe-related troubleshooting, see How to access hidden user library files.

Additional information

Adobe is researching this issue.

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