[Plugin: RomeLuv Google Maps for WordPress] Warning: call_user_func_array()

I tried to install it on 3.3.2 but I find this error instead of the content to the post:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘romeluv_single_map’ not found or invalid function name in [myurl]\wp-includes\plugin.php on line 170

http://ww.wp.xz.cn/extend/plugins/romeluv-google-maps-for-wordpress/