Error when outputting image

Catchable fatal error: Object of class stdClass could not be converted to string in C:\weblocal\ulviken\wp-content\plugins\taxonomy-images\public-filters.php on line 374

i get that when I do:

print apply_filters(‘taxonomy-images-queried-term-image’,”);

What am I doing wrong?

http://ww.wp.xz.cn/extend/plugins/taxonomy-images/