(macOS) Lightroom v6.4 errors and glitches to photos

Question

SO MANY GLITCHES LATELY SINCE THE NEW UPDATE! Errors all over the place when saving photos, they dont download and I have to look at the list and go back to re-save each one. Also some photos will show a complely different-terribly edited-rotated version of another photo. Why?? I just spent 8 hours trying to save a completed gallery and making sure no photo was missing or messed up. 
 
1. Version 6.4 of Lightroom from the Mac App Store 
2. Mac Laptop year 2020
3. Select a group of photos to export,  whether its a group of 8 or 20 or the whole gallery. Click Export Jpeg Large and then you will get the error in the end.
4. I expect to save all photos as a whole group and for them to save no problem. But instead I get a list of errors once the export process is complete.

Sameer K · Answer

Hey, @Sandra5E60. Welcome to the Lightroom community. I'll help you figure this out.

Before troubleshooting, log in to Lightroom Web (https://lightroom.adobe.com) to ensure your work is backed up & synced to the cloud. What troubleshooting steps have you tried?

Try these:

Ensure Lightroom Classic has the required permissions on the macOS: https://community.adobe.com/t5/lightroom-classic-discussions/quick-tips-how-to-give-full-disk-access-to-lightroom-classic-on-macos/td-p/12913413

Go to the following location to launch Lightroom via the terminal.
In Finder > Application Folder > Lightroom > Right-click on Lightroom.app > Show Package Contents > Contents > macOS > Lightroom - double click to open.
If Lightroom does not work, share what comes up in the terminal.

Let me know how it goes. Thanks!
Sameer K

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