I have just started to use Lightroom 2015.8 on an iMac with macOS 10.12.2. I have created a new catalog and tried to import an Aperture library with referenced master images (the master images are all in a folder inside my Pictures folder). However, immediately after starting the import operation, I get an error dialog telling me that there has been an internal error: "?:0: attempt to index a nil value". Nothing has been imported when I close the dialog.
I've browsed the forum for this error and there is this thread which is for a different operation that also fails with this error. The suggested solution is to install an older version of Lightroom. I have tried it now with 2015.7 but the error still pops up. There is also this thread, where the proposed solution is to move the Aperture app to the desktop but this hasn't helped either.
Any help will be appreciated!
Are you adding images directly from the master folder which is saved under the picture folder.
Using the option: File > Plugin in Extras > Import from Aperture Library?
Please refer the below discussion, related to the same issue.
I had this same issue some time ago (a year or two). At that time, I was told that a fix was imminent in the code for the Aperture import. As a result, I have actually not taken Aperture onboard my workflow. Today I tried again, with the latest version in CC, and again, nil value and failure to import. This is exceedingly frustrating as I will not use the product if I cannot import my existing Aperture Libraries.
I should note that I even reduced the size of my Aperture Lib by saving out as smaller subsets in case it was a size issue. However, I did test with a very small library and it still failed.
I would really appreciate a solution.