Error changing modules | Lightroom

When you start Photoshop Lightroom, change modules, or perform other functions, you get an error message such as:

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

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

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

Drag the preference file to the Trash (Mac OS) or Recycling Bin (Windows) and then restart Lightroom. For preference file locations, see:

• Preference file and other file locations | Lightroom 3.x
• Preference file and other file locations | Lightroom 2.x
• Preference file and other file locations | Lightroom 1.x

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

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.

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 your 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.

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.

 

Adobe is researching this issue.