Unknown error (4) when exporting

How can all photos with this problem be found? I all cases, so far "revert to original" clears problem.


OS X 10.15.4 (19E287)

iMac 21.5", macOS 10.15

Posted on May 21, 2020 1:23 PM

Reply
14 replies

May 22, 2020 10:10 AM in response to raina_b22

Yes, did not help. Problem appears to be associated with edits. When an album is exported a list of photos with "unknown error" is provided. They are only files that have been edited, but some edited files in same album are ok.


I ran the Disk Utility First Aid, did not help.


Is there a Photo database search tool that can find photos with missing edit data.


Next I am going to reach back with Time Machine. This will require I export all recent scans I've imported in order to save then.


Al

May 24, 2020 11:55 PM in response to Old Toad

This is happening to me too with all the photos being from Nikkon cameras(two different) . I have noticed this since the switch to Catalina so I think that is the problem. The photos are all perfectly visible and will not export in original unmodified or best quality. I have tried to export singly or in batches. The problem is consistent with all files starting with DSCN and these are not ancient photos. I would like to know what Unknown Error 4 is....I guess it is Unknown to Apple.

May 25, 2020 10:24 AM in response to al92780a

what do you mean revert to original...I tried to export by chosing unmodified original and it still did not work/I dont think that I edited 893 photos...which is what I got the type 4 error on when trying to export 7035 photos...only 6142 succeeded. I am thinking of trying a different photo organizer...I am tired of Photos and iCloud all or none option. Works only if you have a good internet connection.

May 22, 2020 10:24 AM in response to al92780a

As a test launch Photos with the Option key held down and create a new, test library.  Import some photos and test to see if the same problem persists. Does it? (This tells us if the problem is limited to your current library or is more wide spread)


Log into another user account, Set up users, guests, and groups on Mac and see if the problem persists (this tells us if the problem is limited to your user account or is system wide).


Boot into Safe Mode (How to use safe mode on your Mac - Apple Support) by booting with the Shift key held down and check there to see if the problem persists.  Reboot normally and test again.

NOTE: Safe Mode boot can take up to 10 minutes as it's doing some system cache cleaning, volume verifying and directory repairing. 


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Unknown error (4) when exporting

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