Not enough disk space to migrate your library

When launch the new Photo app, and it attempts to migrate my iPhoto library, I receive the message:
״There is not enough disk space to migrate your library. It is estimated that you need at least 33GB of additional free space.
I have 47 GBs free on my main HDD, so I don't understand why this is an issue - anyone else seen similar?
I have a 2013 MacBook Pro with Retina display with 256GB flash drive

I found a solution to this issue, just in case anyone is interested in the future.
Essentially, despite the fact that I freed up some disk space, the amount of free HDD space in About This Mac, and Disk Utility were still showing the "old" disk space. This is a known issue in that these numbers are gathered by the Spotlight index and are NOT a realtime snapshot. Photo's clearly uses the same view of available disk space.
It will eventually resolve itself over time (indeterminable, sorry), but if you want to force the recalculation of the free space, the solution is here:
http://www.macissues.com/2014/05/27/fix-about-this-mac-not-showing-proper-disk-s pace/

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