Node resource calls not working

I can't get node resources calls to work from the service browser.
I got errors like

warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, '_node_resource_retrieve' was given in C:\xampp\htdocs\musescore.com\sites\all\modules\services\services.module on line 344.

It appears that changing line 47 in services.resource-translation.inc from

if (!empty($file) && !empty($method['file'])) {

to

if (!empty($file) && empty($method['file'])) {