I need a PRO for an odd problem with LR 5.3 on a Win 8 computer

hello!  i've been @ problem week plus couple of lr "gurus," no avail, here go again.

 

  week or ago, went export files,and received message:  "the lightroom catalog named, "lightroom 5," catalog" cannot opened because application has opened.  quit other copy of lightroom before trying launch."

 

below paragraph, box 3 options, ""chose different catalog"  "continue"  & "exit"

 

the past people told me use windows explorer locate locate file named "lock"...well, doesn't exist.

 

any takers?

 

thanks!

 

ralph

use operating system's search feature find files name ends .lock, didn't find because looking in wrong folder.

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