Even I am facing the same prob. After I tried the straight method of importing from blogger (with the same error as above), I tried to import it in a dummy wordpress.com blog.
While I could import successfully in that dummy wordpress.com blog, export from thr to my site is not happening.
It gives the following error,,
WordPress could not create the directory ----wp-content/uploads/2008/01
Is the site writable ?
Then I created the said path (the folders) and now I am getting this error..
The uploaded file could not be moved to /home/*****/public_html/******/wp-content/uploads/2008/01.
Any clue ?