Issue changing modules

Hello everyone
I had to reinstall LR and every time I start it now, I get an error message saying "an error occurred while attempting to change modules". I get a blank grey screen, no side panels, but at the bottom it lists how many photos are in the catalog and in the folder. There is no filmstrip. Clicking on Preferences does nothing; no dialogs or anything. It used to run fine.
OSX 10.9.5, The only software issue I have had is not being able to update to Yosemite.
Any suggestions?
Thanks!
joHN

There is a good list of possible work arounds here:
Error changing modules | Lightroom
This is what fixed it (I think. I hope!) for me:
Solution 5: 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 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.

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An error occurred when attempting to change modules.

Loaded LR on my iMac, tried to copy & use a catalogue from W7 P/C. Now get "An error occurred when attempting to change modules." when opening LR. Tried a variety of on-line suggestions, HELP. NB too much hassle with all the other apps to start a new user with such as Adobe and Microsoft.
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Hi, I¹ve been through it again to ensure I¹ve not forgot things. Completely
removed Lightroom and all files I can find, etc and reloaded. Some tedious
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An error occurred while attempting to change modules

I installed Lightroom and when starting the program I get, "An error occurred while attempting to change modules." I get this message within the program when clicking on any of the top right menu items. Also, importing a photo is not listed in the file menu. I deleted the preference file and Lightroom folder in my user preference and reinstalled. I tried many reinstalls, it still has reoccurring error message. Anyone now a fix? I'm running 10.5 on a Core Duo with 2meg of RAM on a 320 gig hard drive with lots of room.

For what it is worth, I was unable to change to the Web and Print modules, and I was also unable to record new presets (though I had successfully done it many times before) though I could still use already created ones. I was baffled, but found a workaround using hints from this and other forums. Much thanks to those who provided me with a starting point as I never would have figured this out on my own.
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Where I screwed up initially was tryiong to use my own presets under her install of lightroom and then creating new ones (which worked) but then trying to import them back into mine. I had the new presets working under my own install, but still couldn't create new ones under my own setup. Finally, I realized that it was the "Develop Presets" folder under my own install that was in some way corrupted and copied her Develop Presets folder into my own install and every thing was fixed. I could even copy the subfolders from my own Develop Presets folder directly back in without issue.
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"an error occurred while attempting to change modules" when launching lightroom

I get the message "an error occurred while attempting to change modules" when I launch the app on my mac.
Every other adobe app works like Photoshop
I have followed all the troubling shooting steps in the link below, not one of them makes anything different. Except I tried the last one. I created a new account, simply logged in and launched the app and everything ran normally. No problem. However it doesn't say what to do if that works it just says try it.
Error changing modules | Lightroom
Obviously this means its going to be an issue with a support file in the one user account but what one?
I also can't un install lightroom either, when I go to the creative cloud plug in on my menu bar the uninstall says its unavailable but the others are fine.
Any ideas?

I just found the answer for me.
I did step 5 on this support article:
Troubleshoot unexpected behavior | User account-specific | Adobe software | Mac OS
It is to repair the permissions on the hidden Library folders.

Downloaded a trial Light room and got "An error occurred when attempting to change modules." Macinto

Downloaded a trial Lightroom and got "An error occurred when attempting to change modules." Macintosh. Created another user and it works. WIll this happen if I make a full purchase? I want to use my administrator user.

Hi ecl44,
This might be due to incorrect preferences / permissions issue on the Mac.
You might want to refer to the KB Doc : http://helpx.adobe.com/lightroom/kb/error-changing-modules-lightroom.html

My new lr3 comes up with the usual error changing modules....

Hello. I've just purchased a lot of adobe software, cs5 Production Premium and Lightroom 3. Now adobe has loaded on fine and is working, but lightroom, asks for my serial number which i enter and then continues to try open, only to come up with the frequently common issue of errors with changing modules.
Now i have only just brought a new Imac this week as well, so i have no idea how to get around it yet and from other discussions on the forum i am so confused and have no idea how to find all the files for the software.
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It is some kind of permissions issue, and weirdly it often seems to be linked to Nik software. I wonder if Nik's putting a file there with different permissions - did you install Nik first, by any chance?
Anyway, to fix, you can just copy the files over from the other account. Copy the folder from the guest account after you've entered your serial number in LR3 in the guest account. You might need to transfer them to another shared location temporarily.
From memory, primary folder to transfer is Macintosh HD / Users / [username] / Library / Application Support / Adobe / Lightroom /
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Hello
I puchased a new imac yesterday my first apple product so no experience with it. I have purchase lightroom 5 today as a download when I instal it I get an error message.
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Hi
Thanks Rave
I will try the sugestion in this doc. The problem is I am completly new to mac and I have to find my way around I had lightromm 4 on my pc and never had an issue with it.
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Will work on it.
Thanks
RuralTraveler1111

Error on Mac: An error occurred when attempting to change modules.

Installed the trial successfully. Tried to launch the application, and this error message came up. When I click on OK, only minimal parts of the Lightroom interface show up.
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OS X 10.4.9/PPC.

This has come up as a problem for me TWICE now. It's extremely frustrating. Here is what I know, which hopefully will help anyone else who runs across this issue and wasn't helped by the previous suggestions (which are all pretty good ones, I might add).
The first time this happened, it was simply because my hard drive was full. I know, it sound so silly, but I went through several re-installations before I realized that the drive on which I stored my photos had filled to the brim (less than 1 MB remaining), and as soon as I cleared up space, the "change modules" error went away.
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Help.
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Thanks for the reply, but I've already been all over that page.
Solution 1: I have version 5.3. Is there a newer one?
Solution 2: Preference files trashed multiple times with no improvement.
Total uninstall, re-install, same problem.
Solution 3: No better. New catalog created from within LR, same problem.
Open LR with option key, choose catalog, test for integrity, same problem.
Solution 4: Uninstalled Nik, even though it states for LR3. No better, same
problem. Note: re-installed Nik, it did not recognize LR, recognized
Photoshop without problem. BTW, Photoshop is working great.
Solution 5: Permissions are set correctly on all folders. Will re-check ONE
more time, just to be sure.
Solution 6: New user account. Have not done this yet. Hard to see why this
would be a problem, as I just obtained the computer four days ago, and I am
the only user. But in the interests of completeness, I will give it a try.
Could this be some new iMac issue? Graphics card?
Using iMac 27", 3.5 GHz i7; 16GB RAM, 3TB Fusion drive; Nvidia GTX 780M.
This is very frustrating. I need to get back to work and something is wrong
here.
John

Did anyone experience "an error occured when attempting to change modules"?

did anyone have this issue and how was it resolved?

Let's see:
https://forums.adobe.com/search.jspa?q=%22an+error+occured+when+attempting+to+change+modul es%22

Despite it is claimed in Adobe forum that Lightroom is fully compatible with OS Maverics on my MacBook Air IT IS NOT. A message "an error occurred while attempting to change modules" appears and I cannot go any further. Can anyone help?

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Surely the Adobe forums are the place for help with Adobe applications. The fact that the problem doesn't occur on your daughter's machine suggests that it's not an issue with Mavericks but a local problem on your own machine.

Tried all 6steps to Error Message: An error has occurred when attempting to change modules-Please help thx

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Hi, I¹ve been through it again to ensure I¹ve not forgot things. Completely
removed Lightroom and all files I can find, etc and reloaded. Some tedious
result. Step 6 is too time consuming at the moment for me, too many things
on the go since I¹m about to go on holiday and on return I shall need
Lightroom on this iMac. Any clues? This iMac had Mavericks from new,
uploaded to Yosemite and then loaded Photoshop CC, Lightroom etc and get
this damned problem.
Reading around the web I¹m not the only one with this issue, to suggest a
new user a/c is a soft option without resolving the issue.
I hope an expert from Adobe can resolve this,
Regards, George (retired IT Manager and IT Systems Project Manager)

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Just had the same issue... went through the steps here: https://helpx.adobe.com/lightroom/kb/error-changing-modules-lightroom.html
For me it was Solution 5. I had to change permissions and add me as a user (only had system access to the folders).

Error Message when changing modules??? Help

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Hi hillclimbing,
Can you please let me know the exact error message you see as that would be helpful.
Does this occur with all the pdf files.
What OS and Acrobat version are you using?
Regards,
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