Cannot open any of my Lightroom catalogs. "Error occurred when trying to change modules."

Bought a new 2013 Mac Pro and did a new install of Photoshop and Lightroom. Then physically moved my data drives over from Mac Pro (10.8.6), but LR won’t open any of the existing catalogs on the new computer (10.9.5). Followed steps 1-5 at http://helpx.adobe.com/lightroom/kb/error-changing-modules-lightroom.html
Cannot do step #6 (no access to more than one user at a time).
Please help.

TimOlive wrote:
LR is also unable to open a small LR catalog it created on the internal Macintoch HD SSD, back when this copy of LR was installed.
How and where did you create that small catalog? Sorry for the question, but you do have licensed version of LR 5 and you only use it in your old computer? In other words, you do not have a second copy installed on a laptop, do you?
If you have a licensed version and have only install it in your old computer and you cannot create a brand new catalog on the SSD with the enclosure disconnected (forget about the catalog already on the SSD drive), it is likely to be the installation. If this the case, try downloading the 5.7.1 and reinstall (Adobe - Lightroom : For Macintosh : Adobe Photoshop Lightroom 5.7.1). I would recommend to do the reinstall with the enclosure disconnected, after it is done check if you can create a catalog on the local drive, if you ca connect the enclosure.

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I Just installed Crative Cloud Lightroom try-version but when i open the program it say "An error occurred when attempting to change modules." ?

I Just installed Crative Cloud Lightroom try-version but when i open the program it say "An error occurred when attempting to change modules." ?

Try giving permission to Lightroom folder under
/Users/[user name]/Library/Application Support/Adobe
Steps
Click on Finder and on the menu bar ( top side the of the screen) click on Go > Go to,folder
In the window type exactly ~/Library and click on Go
Open Application Support > Adobe and right click on Lightroom folder and select get info
Under sharing and permission Click on lock and unlock it
Click on + add your current user name and administrator if not added
Then give Read and Write permission for Admin, system, everyone and (your user name)
Click on gear icon and choose apply to enclosed item
Then Click on Lock
Launch Lightroom and check.

Lr 2.2 broken - an error occurred when trying to change modules

I get the message "an error occurred when trying to change modules when I try to go into library mode. quit and restart didn't help. Catalog verified as okay. Worked before update.

Deleting preferences did not help. I also tried creating a new lightroom catalog, and can navigate around it fine. However, if I do something like change to Library in the new catalog and then open my useful catalog, I immediately get the error changing modules message. I tried reimporting my useful catalog, which also did not work. My understanding is that this error is some kind of catch all which could indicate any number of different issues - is there a way for me to roll back to 2.1? Is there a reason that so many people are having an issue with this upgrade (there are posts in other forums and blogs about people having this same issue after upgrading).

"an error occurred when trying to change modules"

When I switch repeatedly between Library and Develop with the R and E keys, I always sooner or later run into a problem where nothing happens when I press R. Really that should go the Develop module and enter crop mode -- what I'm usually trying to do, when this happens, is crop a bunch of photos. So I'll be using Library mode to identify the photos that need cropping, stepping through photos with the arrow keys, then when I find one that I want to crop, I press R, enter develop+crop mode, crop the photo, press E to return to library+loupe view, and continue.
Sometimes this works 10 times, sometimes it only works twice, but always, relatively soon, when I press R, "nothing" will happen. Actually what's happening is an error dialog appears saying "an error occurred when trying to change modules", then the error dialog immediately disappears before I can read it. I know what it says, because if I click the Develop module with the mouse, I get the same message but it sticks around until I press OK.
Once this happens, I'm entirely unable to use the Develop module until I quit the program. I had to quit and restart LR about 20 times during an hour of working with it last night, and this morning, in the first 15 minutes, I'm already on the 3rd restart.
Anyone else see this?
Details: LR 1.1 on Mac OS 10.4.10, 4-core Mac Pro, images are a mix of JPG from a pocket camera and NEF from a Nikon D40. I don't think it is related to the specific images, as it strikes apparently at random, and after exit and restart, I can crop that same photo, but a different one will eventually cause the same problem again.

Sean, thanks for the Return key tip. I knew about that at one point, but lately I was trying to use Enter (the one on the numeric keypad, at the very lower right corner of the keyboard, which is really easy to hit with my thumb even when my hand is on the mouse! And Enter doesn't invoke the crop, so I forgot that Return did). That is a better way.
I don't see the RE problem on my MacBook, only on my desktop computer, and that one is also experiencing other flakiness (
metamatt, "missing text / thumbnails / many Lightroom UI elements disappeared" #, 18 Aug 2007 3:08 pm) so I think I'm going to try a complete reinstall there.

Lightroom: "An error occurred when attempting to change modules."

I'm a first time Lightroom(via the Cloud) user (used Capture One before this) and just downloaded it today. The first thing I saw was this error message
"An error occurred when attempting to change modules."
I've updated it to 4.3 and I've tried all the other recommendations I found here:
http://helpx.adobe.com/lightroom/kb/error-changing-modules-lightroom.html
I don't know what Nik products are but I don't believe I have any.
I'm on a Mac running 10.6.8
Removed this preference file I found here:
http://helpx.adobe.com/lightroom/kb/preference-file-locations-lightroom-4.html
So frustrating! Please, can anyone help me???

I can only quote from the webpage that you already visited RE: Permission.
You need to have full permission for reading and writing for the folders and drives that Lr is using - particularly the folder that contains the catalog (i.e. the database Lr is working with).
If you have full permission try re-installing Lr. Un-install it via your OS. And re-install it.
Also, occasionally downloaded programs can become damaged during download - for instance when the download has been interrupted.
Before you re-install, I'd recommend that you download Lr again and use this second download for re-installation.
From the webpage (particularly read the part about Macs):
Solution 5: Set correct permissions on Lightroom folder inside Application 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.
Solution 6: 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.

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thank u
terry

Hi, this link outlines the solution: http://forums.adobe.com/message/4955952#4955952
It is all about folder permissions.
Tony Jay

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A forum thread from 3 years ago talking about LR 1.x which had this problem seems to need permissions fixed or new folders created with the corrected permissions. You might try doing a repair permissions for your user and/or run LR as an administrator user. I am a PC person so cannot tell you exactly how to do that.
https://forums.adobe.com/message/1457020

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An error occurred when attempting to change modules Lightroom 5 CC

I've seen other users pose this question but haven't seen any solutions that work for me. I get the error: "An error occurred when attempting to change modules" when I open up Lightroom 5 on one user, but on another user it opens up fine. I've tried moving and trashing preferences, uninstalling and reinstalling the program. It's the same whether I open an existing catalog or try to open Lightroom while creating a new project. Any help would be greatly appreciated. This occured after updating to Mavericks on a 2011 iMac. All other Creative Cloud apps seem to have installed just fine.

Hi 99jon,
Many thanks for that. Had been going through this list yesterday and now again today:
Ref Solution 1: Lightroom is at its latest update
Ref Solution 2: It's interesting how I cannot find the Preferences file anywhere on my mac. (new mac pro, OS 10/9.2) . . .
Ref Solution 3: Lightroom doesn't allow me to do anything after the error message appears
Ref Solution 4: don't have any Nik Software plug-ins
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Cannot open any of my Lightroom catalogs. "Error occurred when trying to change modules."

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