Issue when passing nested structure

[mstodulski]

Hi,
I've been using your library for a while and it's working great, but I hit a problem. When attempting to execute query with passing args to create an object that contains another object, which contains a collection of another objects, I receive a weird error message:

Field "arrayOfComplexObjectsLevel3" is not defined by type "complexObjectLevel2". Did you mean "arrayOfComplexObjectsLevel3"?

Problem can be reproduced using the code of service placed here:

https://github.com/mstodulski/graphql-example

and quering the service using curl from the command line:

curl http://localhost -H 'content-type: application/json' -d '{"query": "mutation { addComplexObject( name: \"Example complex object name\", complexObjectLevel2: { arrayOfComplexObjectsLevel3: [ { nameLevel3: \"Example level 3 name 1\" }, { nameLevel3: \"Example level 3 name 2\" }, { nameLevel3: \"Example level 3 name 3\" } ] } ) { name } }"}'

Could you help me with this? It seems to me this structure should be accepted according to the GraphQL standard.