Unable to import data - option 14

The import data stops with following error ...

Media “64” already exists.
Media “65” already exists.
Media “66” already exists.
Media “67” already exists.
Media “68” already exists.
Media “69” already exists.
Media “70” already exists.
Media “71” already exists.
Media “72” already exists.

Dont get a success message - some media is imported and none of pages are imported. Brands/Categories have been imported. Please help!

Thanks