When I'm trying to import the demo xml file I'm getting the following error every time:

Failed to import Media “10hero”
Failed to import Media “01hero”
Failed to import Media “02hero”
Failed to import Media “03hero”
Failed to import Media “04hero”
Failed to import Media “05hero”
Failed to import Media “06hero”
Failed to import Media “07hero”
Failed to import Media “08hero”
Failed to import Media “09hero”
Failed to import Media “4hero”
Failed to import Media “1-1”
Failed to import Media “1hero”
Failed to import Media “3”
Failed to import Media “1”
Failed to import Media “client-08”
Failed to import Media “client-01”
Failed to import Media “client-02”
Failed to import Media “client-03”
Failed to import Media “client-04”
Failed to import Media “client-05”
Failed to import Media “client-06”
Failed to import Media “client-07”
Failed to import Media “ss06”
Failed to import Media “ss01”
Failed to import Media “ss04”
Failed to import Media “dp05”
Failed to import Media “dp06”
Failed to import Media “dp01”
Failed to import Media “dp02”
Failed to import Media “dp03”
Failed to import Media “dp04”
Failed to import Media “video-cover”
Failed to import Media “lr01”
Failed to import Media “lr02”
Failed to import Media “ib04”
Failed to import Media “ib01”
Failed to import Media “ib02”
Failed to import Media “ib03”
Failed to import Media “ts01”
Failed to import Media “ts02”
Failed to import Media “ts03”
Failed to import Media “ts04”
Failed to import Media “ts05”
Failed to import Media “ts06”
Failed to import Media “fh01”
Failed to import Media “fh02”
Failed to import Media “fh03”
Failed to import Media “fh04”
Failed to import Media “fh05”
Failed to import Media “fh06”
Failed to import Media “fh07”
Failed to import Media “fh08”
Failed to import Media “fh09”
Failed to import Media “fh10”
Failed to import Media “fh11”
Failed to import Media “fh12”
Failed to import Media “fh13”
Failed to import Media “fh14”
Failed to import Media “fh15”
Failed to import Media “fh16”
Failed to import Media “fh17”
Failed to import Media “fh18”
Failed to import Media “fh19”
Failed to import Media “wh01”
Failed to import Media “wh02”
Failed to import Media “wh03”
Failed to import Media “wh04”
Failed to import Media “sb01”
Failed to import Media “sb02”
Failed to import Media “sb03”
Failed to import Media “sb04”
Failed to import Media “sb05”
Failed to import Media “sb06”
Failed to import Media “sb07”
Failed to import Media “sb08”
Failed to import Media “sb09”
Failed to import Media “nd01”
Failed to import Media “nd02”
Failed to import Media “nd03”
Page “Sample Page” already exists.
Page “Privacy Policy” already exists.
Page “Fullscreen Slider” already exists.
Page “Small Carousel” already exists.
Page “Large Carousel” already exists.
Page “Classic Portfolio” already exists.
Failed to import Media “nd04”
Failed to import Media “nd05”
Failed to import Media “nd06”
Failed to import Media “client-01”
Post “Hello world!” already exists.
Page “About” already exists.
Page “Contact” already exists.
Portfolio “THUNDER STRIKE” already exists.
Portfolio “FOREST HOUSE” already exists.
Portfolio “WILD HORSE” already exists.
Portfolio “SPORT BLACK” already exists.
Portfolio “NEON DUDE” already exists.
Portfolio “INFO BUGS” already exists.
Portfolio “LADY IN RED” already exists.
Portfolio “ELIE SAAB” already exists.
Portfolio “DARK PATH” already exists.
Portfolio “THE QUEEN” already exists.
Page “Stories” already exists.
Post “Endless Road Stories” already exists.
Post “Blonde Surf Girl” already exists.
Post “Bird Eye Shots” already exists.
Post “Desert Treasure Hunt” already exists.
Post “Blue Ocean Waves” already exists.
Page “temp” already exists.
Contact Form “Contact form 1” already exists.

I'm running the latest version of Wordpress and all the plugins are installed.