Lightroom 5 cannot open catalogue

suddenly Lightroom says during launch: "Der Lightroom-Katalog “Fotos” kann nicht geöffnet werden, da er bereits von einer anderen Anwendung geöffnet wurde." "Can not open Lightroom Catalogue "Fotos" because it's used by another Programm" No other App is running. What can I do?!
I use an extern HDD, where my catalogue and the files are stored. Restarting, unmounting the HDDs, nothing works

Go to the folder that contains your catalog file, delete a file whose name ends with .lock
Do not delete any other files

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Lightroom catalog cannot open because it is "busy in another programm" - What can I do?

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Try looking in your catalog folder to see if there is a file with the .lock extension. It should have the same name as your catalog file if one is there. If you find such a file you need to delete it. After you do that Lightroom should start normally.

Lightroom will not open, says it is open in another catalogue

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Dear colleagues,
I installed Lightroom CC successfully but cannot open the program. What can I do?
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Puttetorpa
The situation with Premiere Elements 8.0/8.0.1 and version earlier than it (in particular 3.0/3.0.2) is disturbing with regard to MPEG2 Activation.
Adobe document says that it no longer supports MPEG2 Activation for versions 8.0/8.0.1 and earlier and points the users of this group of products to a version later than 8.0/8.0.1, the current latest version 12.
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http://www.squared5.com/
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ATR

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Den 29/12/2013 kl. 15.58 skrev Sulaco:
Re: Cannot open DNG files in CS3 or Lightroom?
created by Sulaco in Photoshop General Discussion - View the full discussion
As far as I know DNG is supposed to be standardised format. What are you using to convert the RAW files to DNG?
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Cannot open Lightroom 5.6

"Cannot open Lightroom 5 Catalog because another application already has it open"
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LR4.4: Cannot open Raw files from Olympus OM-D E-M1 [was:Adobe lightroom.]

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Thanks John you have been a great help! I will see what suits me best!
Enviado desde mi iPad margaret.
El 09/11/2013, a las 07:33, John Waller <[email protected]> escribió:
Re: LR4.4: Cannot open Raw files from Olympus OM E-1 was:Adobe lightroom.
created by John Waller in Photoshop Lightroom - View the full discussion
DNG Converter.
Read all about it here
http://www.adobe.com/products/photoshop/extend.displayTab2.html
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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?
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You need to have writing permission where a LR catalog is stored.
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If you do not agree, remedy the writing permission for your user account at the backup spot.
Cornelia

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