Ninject xml Inject from another class library

Question

I am trying to inject from another class library but it doesn't work, i am getting this error: Couldn't resolve type 'BLL.UserBLL, MyProject.Core' defined in 'to' attribute.

XML:

<module name="MyModule">
  <bind service="IUserBLL, MyWebProject"
        to="BLL.UserBLL, MyProject.Core" name="UserBLL" />
</module>

So i am trying to use the class UserBLL in the namespace "BLL" in the external class library "MyProject.Core".

The MyProject.Core is refered in MyWebProject

What am i doing wrong?