How do I post a story from external source? Error requested function Array does not exist.

I use sites that allow me to "blog this" and it asks for a xmlrpc api.

I set up Blogapi in drupal for moveable type.

When i set this up on the other site, it doesnt work. i get this error

There was an error posting your item - server error. requested function Array does not exist.

anyone have any idea whats going on? or can anyone suggest a good external posting program app or service?