graphql-dotnet: Unable to use object in mutation.

I’ve been trying to get a mutation to work in graphiql for several days. Here’s the mutation:

public class DataViewMutation : ObjectGraphType
   {
       public DataViewMutation(IDataViewRepository data)
       {
           Name = "DataViewMutation";

           Field<DataViewType>(
               "createDataView",
               arguments: new QueryArguments(
                   new QueryArgument<NonNullGraphType<DataViewInputType>> { Name = "dataView" }
               ),
               resolve: context =>
               {
                   var dataView = context.GetArgument<DataViewInputType>("dataView");
                   
                   var name = context.GetArgument<string>("viewName");
                   var fields = context.GetArgument<ListGraphType<StringGraphType>>("viewColumns");

                   return data.Query(new string[] { "" }, "");//This is empty for now, but I don't even get this far.
               });
       }
   }
}

Here’s the input type:

public class DataViewInputType : InputObjectGraphType<DataViewType>
{
        public DataViewInputType()
	{
	   Name = "DataViewInput";
            Field<NonNullGraphType<StringGraphType>>("viewName");
            Field<NonNullGraphType<StringGraphType>>("clientName",
            resolve: context =>
            {
                return context.GetArgument<List<string>>("clientName");
            });
            Field<ListGraphType<StringGraphType>>("viewColumns",
                resolve: context => {
                    var columns = context.GetArgument<List<string>>("viewColumns");
                    return columns;
                    }
                );
	 }
}

Here’s the call to the mutation:

mutation DataView($dataView: DataViewInput!) {
  createDataView(dataView: $dataView) {
    viewName
    viewColumns {
      columnName
      
    }
  }
}

variables:

{
  "dataView": {
    "viewName": "v_ReadyReports",
    "clientName": "Suntime",
    "viewColumns": [
      "id",
      "product"
    ]
  }
}

And here’s the error:

{
  "errors": [
    {
      "message": "GraphQL.ExecutionError: Variable '$dataView' is invalid. Unable to parse input as a 'DataViewInput' type. Did you provide a List or Scalar value accidentally? ---> GraphQL.Execution.InvalidValueException: Variable '$dataView' is invalid. Unable to parse input as a 'DataViewInput' type. Did you provide a List or Scalar value accidentally?\r\n   at GraphQL.DocumentExecuter.AssertValidValue(ISchema schema, IGraphType type, Object input, String fieldName)\r\n   at GraphQL.DocumentExecuter.AssertValidValue(ISchema schema, IGraphType type, Object input, String fieldName)\r\n   at GraphQL.DocumentExecuter.GetVariableValue(Document document, ISchema schema, VariableDefinition variable, Object input)\r\n   at GraphQL.DocumentExecuter.<>c__DisplayClass28_0.<GetVariableValues>b__0(VariableDefinition v)\r\n   at GraphQL.EnumerableExtensions.Apply[T](IEnumerable`1 items, Action`1 action)\r\n   at GraphQL.DocumentExecuter.GetVariableValues(Document document, ISchema schema, VariableDefinitions variableDefinitions, Inputs inputs)\r\n   at GraphQL.DocumentExecuter.BuildExecutionContext(ISchema schema, Object root, Document document, Operation operation, Inputs inputs, Object userContext, CancellationToken cancellationToken, Metrics metrics)\r\n   at GraphQL.DocumentExecuter.<ExecuteAsync>d__12.MoveNext()\r\n   --- End of inner exception stack trace ---"
    }
  ]
}

I’ve tried everything I can think of but I’ve been stuck for several days. How do I get this to work?

-Erick