System.Linq.Expressions: No coercion operator is defined between types 'System.Object' and 'System.Void'.

i'm trying to convert an existing demo project (graphql server) with custom DI to the new native dependency injection of azure functions but i get a `No coercion operator is defined between types 'System.Object' and 'System.Void'.`

working branch with custom DI: https://github.com/OneCyrus/GraphQL-AzureFunctions-HotChocolate/tree/master

migrated project which gives the error: https://github.com/OneCyrus/GraphQL-AzureFunctions-HotChocolate/tree/feat_nativeDI

#### Investigative information

local dev environment

Azure Functions Core Tools (2.7.1158 Commit hash: f2d2a2816e038165826c7409c6d10c0527e8955b)
Function Runtime Version: 2.0.12438.0

#### Repro steps

1. checkout this branch and start the project. https://github.com/OneCyrus/GraphQL-AzureFunctions-HotChocolate/tree/feat_nativeDI
2. calling the function at http://localhost:7071/api/graphql
3. gives the following error

```
[13.05.2019 19:15:13] An unhandled host error has occurred.
[13.05.2019 19:15:13] System.Linq.Expressions: No coercion operator is defined between types 'System.Object' and 'System.Void'.
```

checking out the master with custom DI works fine.