That's a substantial amount of images to export as one catalog and your operating system may be choking for lack of memory and capacity. Just my thoughts.
Do you have the option to include the images in the Catalog.
We're sorry hear about the folder not exporting as a catalog, could you please let us know which exact version of Lightroom you're working on and which operating system are you using?
Also, where are you exporting the catalog on an internal drive or and external drive?
Thanks for the additional information, could you please try exporting it to the internal drive and let us know if it works?
The missing files indicate that the previously imported files are no longer at their previous location (full path and file name).
Any chance there is an unplugged external drive involved or a drive with a changed name?
In the Library module, check the "Folders" panel to see if any of the drives or folders are marked as missing.
The error message indicates that one photo is missing - you may have moved or deleted it in Finder. In your catalogue, find that photo and click the missing file icon so you can tell LR where the photo is now located.
Thanks for the suggestions everyone! I knew that the error message about the missing file was because a file could have been deleted/moved in Finder, which then shows a little exclamation mark on the top right hand side of the thumbnail and photograph when you view it in Lightroom, but I assumed that synchronising the folder (in Lightroom) would highlight the missing file/help to resolve this, but clearly that function is not for this issue.
Anyway, I'm trying the suggestions and also going to try excluding previews from the export and I'll let you know how it goes.
The synchronisation dialog box has a checkbox for what to do with missing files. In general, I would recommend not checking it.
The previews part of the message isn't important - focus efforts on finding that missing file or removing it from your catalogue (if you deliberately deleted it).
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"Syncing" has nothing to do with finding missing files.
First check your Folders panel to see if any folders are missing. If yes, you need to fix this first using the "find missing folder" process.
After all the missing folders are located, if any image files are still missing, you need to do the "find missing files" process.
See this link for details: