Unexpected Error Opening Catalog

[#1]

Issue=

I recive the following error when trying to open any Lightroom project on any of my harddrives (I've tested 6 drives all with the same error). Lighroom itself will not open on it's own. I cannot choose a new catalog and/or defalut catalog. I just recive the same error :

Working off of:

macOS Mojave Version 10.14.6

Mac Pro (late 2013)

Processor 3.5 GHz 6-Core Intel Xeon E5

Graphics AMD FirePro D500 3 gb

I work in Premiere / other Adobe programs regularly those are working fine. 

I have re started my computer - no change. 

I have unistalled and re-installed Lighroom- no change. 

Please advise - thank you. 

[#2]

Issue=

I recive the following error when trying to open any Lightroom project on any of my harddrives (I've tested 6 drives all with the same error). Lighroom itself will not open on it's own. I cannot choose a new catalog and/or defalut catalog. I just recive the same error :

Working off of:

macOS Mojave Version 10.14.6

Mac Pro (late 2013)

Processor 3.5 GHz 6-Core Intel Xeon E5

Graphics AMD FirePro D500 3 gb

I work in Premiere / other Adobe programs regularly those are working fine. 

I have re started my computer - no change. 

I have unistalled and re-installed Lighroom- no change. 

Please advise - thank you. 

[#3 · Accepted solution]

Revert back to LrC 9.4. Reports indicate that can still read your LrC 9.4 catalog. https://helpx.adobe.com/download-install/using/install-previous-version.html

[#4]

Thank you, I will try this now

[#5]

This works! Thank you dj_paige

[#6]

* This is Lightroom Version 10.0