Problem when importing from D6 to D7

I try to import modules from D6 to D7. The content types are defined in the same way and the cck field are just text fields. The import works ok but the extra textfields are set to blank. The following error also comes up

Notice: Undefined index: in node_export_file_alter_filefield() (line 218 of /mysites/sh7/sites/all/modules/node_export/modules/node_export_file/node_export_file.module)

I know that D7 is in dev. but I thought I'd file it anyway. Thanks for a great module.

Cheers

Martin