An unhandled exception of type 'Protoinject.ActivationException' occurred in mscorlib.dll

Additional information: The planned node is not valid (hint: The factory interface 'FirstProtobuild.IEntityFactory' doesn't have a generated factory for it.  Make sure the factory interface inherits from IGenerateFactory so that the generator will implement it for you.) while underneath '(FirstProtobuild.FirstProtobuildWorld)'