Lightroom cannot read external harddrive after MAC upgrade

Hi,
I recently ugraded to MAC Yosemite and now Lightroom has "?" next to all my folders and cannot find my pictures.  I have over 50,000 pictures ...HELP!   My computer is showing that my external with all my pictures is there.
Thank you!

Follow these instructions to fix the problem: http://www.computer-darkroom.com/lr2_find_folder/find-folder.htm

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