Fatal Error on Import

Fatal error: Cannot use object of type WP_Error as array in path\to\wp-content\plugins\readymade-wordpress-importer-061\wordpress-importer.php on line 1297

as i am not a developer, i have to rely on the info that is available on the forums. i first tried to import without the plugins on the other site and got a lot of additional error messages. after installing those plugins, i tried to import again, however this error persisted. i googled and came up with a very old thread that suggested removing spaces and certain parts of the import.xml, however that also did not work.

any pointers?

http://wordpress.org/extend/plugins/readymade-wordpress-importer-061/