While installing IBooks, getting 'An unknown error has occured'

While installing iBooks, getting an error "An unknown error has occured"

I have the same error, I'm working with Illustrator CC on my MacBook Pro Retina 15" (late 2012 model) with OS X Yosemite, my video card is NVIDIA GeForce GT 650M.
Earlier I haven't any problem with illustrator, but now I have. Help ma please.

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