Exporting problem with LrC 9.4

[#1]

When I decide to export one or more photos, I get this error message "unable to write files". There is space on the local disk (more than 30 gigabytes). I tried changing catalog and destination folder. Already installed / uninstalled the program and restarted the computer. Anyone can help me? has anyone had the same problem?

[#2]

What OS?

When was the OS updated?

[#3]

What is the full word-for-word error message?

 Are the photos showing an exclamation point icon in the Grid View?

[#4]

If you happen to be on a Mac, a more updated OS, you may need to give LR 'permission' to write to the disk in System Preferences>Security & Privacy. Otherwise we do need to know more about the OS.