Error Message -
Unexpected error opening catalog.
The catalog could not be opened due to an unexpected error.
/version and computer info
Lightroom version: 4.4 
Version: 10.11 
Application architecture: x64
Logical processor count: 4
Processor speed: 3.2 GHz
Built-in memory: 8192.0 MB
Real memory available to Lightroom: 8192.0 MB
Real memory used by Lightroom: 251.7 MB (3.0%)
Virtual memory used by Lightroom: 524.1 MB
Memory cache size: 0.0 MB
Maximum thread count used by Camera Raw: 4
Displays: 1) 2560x1440
I tried creating a new Cataloge and I am able to open the application. I tried opening the application with my most recent back up (3/25/16) but I get the same error.
Can you please help?
Have you tried opening other backed up catalog in Lightroom and does that work.
please refer the related discussion, refer: Re: Catalog will not open due to "unexpected error".
I tried going backwards from my latest backup and it looks like one has worked but it from 2-23. Have I lost all the work I have done since then?