It happens often recently, I can't open LR and a message reads " not posible to open the lR catalog called .... because it is open in another application "; " leave the other copy of LR before any attempt to launch it"; the options are "continue" and it goes back to the same message, or "select another catalog" and if I select an older one (the one before the last LR update) it reads "unexpected error at the opening of the catalog" and nothing opens.
I have everytime great difficulties to make it work again, cleaning , defragment, restarting the PC... And with a little luck it would open again; thank you for your help.
Your post was moved to a better forum, LrC.
Go to the folder where the catalog is located. There should be a file whose name ends with .LOCK (might be lower case .lock) and delete this one file. DO NOT DELETE ANYTHING ELSE.
I deleted such a file. Did not help at all.
Finally, after I delete the 'lock'file also in the trashfolder, LRC has start uopagain!
It's true that deleting this .lock file worked, but this time it didn't.
And just now something different : a message saying "update to V.10" I clicked Ok, LR opened but without my catalog (about 35000 pictures...), and it says "import" but what should I import ? The original pictures, the previous catalog digital pictures 2...2.Ircat or this new one 2...2-v10.ircat ? I don't want to make any mistake, I have modified thousand of pics and created many books within LR ...
Well I solved my problem this way; as nothing worked I tried another update to the new v.10 version of LR; it created a v.10-2.Ircat catalog which worked well, so I erased the previous v.10.Ircat; probably something went wrong during the first update. Phew ! back to this good'ol LR...