Classic CC will not launch

[Moonshot]

Says to choose a different catalog.  Adobe instructions say to find the lrcat.lock files and move them to trash.  Found 2 of them and removed them to trash.  Lightroom still will not launch.  Same error message.  Cannot find any more lock files to remove.  What next?

[GoldingD]

First, shut your computer down, wait until it is most defiantly off. Then turn it back on (a cold boot)

see if LR will then launch.

[GoldingD]

Next up, “states to choose a different catalog”?

if this is a windows computer, hold down the CNTRL key, and while doing that click on the LR classic icon. You should be presented with a screen othering various catalogs to open (well if you have multiple catalogs), an porotunity to create a new catalog, and an oprotunity to accomplish an integrety check on a catalog you open, all optional.

try creating a new catalog, see what happens.

if you are lucky at this point, turn if GPU support if turned on, then close zlR, and restart the same way, but open the old catalog, see what happens.

possibke catalog corruption???

[Moonshot]

Lightroom opened with new catalog but that has no photos in it.  I closed LR and relaunched to the same old error message.  I do not know how to turn on GPU support on this windows computer so I assume it is not on. 

[GoldingD]

Third, if none of the above worked , and both of those do not nessecarily solve anything, but can be used to indicate what the root issue is, turn the computer off again, This time accomplish a safe boot to start the computer with a minimal amount of drivers running, a minimal amount of non standard hardware support, etc.

see if LR will launch

If so, take this oprotuinity to turn off GPU support if on. And exit LR, reboot as normal, see if LR works,

If nit, then something might be wrong with thr zoS, a driver, a bit if hardware, another bit of software.

[Moonshot · Accepted solution]

OK.  Finally!  After numerous attempts to get Windows updates (still not complete), troubleshoot my computer, etc, I finally checked one last time in the files and folders under Lightroom in the file tree looking to perhaps launch by clicking on a catalog there and found a lock folder I had not found before.  Deleted that and tried to launch LR and tadah!  It worked! 

[GoldingD]

Glad you are up and running.

One tip, if for some reason you want to close LR then turn around and restart LR, say for example, you are comparing performance with the GPU acceleration then without. Well, give your computer more than just a few seconds, it takes a few for LR to delete that lock file.

And as a courtesy, to aid other members in seeing whats new, old, resolved as opposed to unresolved, go and give yourself credit (your last reply) as a correct answered, so that this posting shows up as resolved (green),  If the forujm system fails to allow that, then in actions (I think) clcik on assumed answered (have not been involved with that in a long time, so I forget how)

[Per Berntsen]

davidg36166309  wrote

One tip, if for some reason you want to close LR then turn around and restart LR, say for example, you are comparing performance with the GPU acceleration then without. Well, give your computer more than just a few seconds, it takes a few for LR to delete that lock file.

Normally, the lock file will be deleted automatically the second Lightroom is closed.

When Lightroom is not closed down properly – crash or power failure – the lock file may not be deleted.

Turning the computer off will not delete any lock files caused by an improper shutdown, they have to be deleted manually.

And the GPU has nothing to do with this.

[GoldingD]

Was not, in that response, talking about turning the computer off. Just mentioning if you closed LR then  reopened LR you can have this issue. In my case, I need to give more than a couple of heartbeats before doing so, if not, LR fails to open, just try again and it opens. apparently I am sometime too quick on the draw, LR was still busy deleting the lock file. I was doing that to test things out, comparing changes in settings. If I had instead closed LR and taken a sip of coffee, then opened LR, this issue would not come up. This would not normally be an issue.Just a by the way. Nothing to do with the OP issue.