Every time I import 16 nodes, I'm getting alot of warnings like this one:
Warning: Invalid argument supplied for foreach() in node_export_file_field_import() (line 1091 of .../node_export/node_export.module).

So i created a little patch, not sure if this is a hack or not.

Files: 
CommentFileSizeAuthor
check-field.patch1.79 KBumtj