Same issue here. Mailed @allaerd, he responded initially but suddenly went dark.
I got the following error after debugging;
<b>Fatal error</b>: Cannot use object of type WP_Error as array in <b>/home/<private>/public_html/wp-content/plugins/woocommerce-csvimport-attributes/woocommerce-csvimport-attributes.php</b> on line <b>179</b><br>
