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-Premiere Pro Video Editing Information FAQ http://forums.adobe.com/message/4200840
Hi, I had the same problem since yesterday. Apperently LR made a subdirectory on my destination-drive, which wasn't accesable for LR.
By reselecting my destination (in the upper-right corner) everything works fine again.
I can't explain the cause for this, because the problem occured when I wanted to import the second out of 3 sets of pictures I wanted to import.
The first set gave no problem at all, and the second one, just a few minutes later caused me all this trouble of desperatly seeking for an answer.
Hope it will be usefull for you as well.