Error during serialization or deserialization using the JSON JavaScriptSerializer

I'm facing a problem on asp.ne framework application: On sending a form to action I receive a complex type that is automatic deserialized by JavaScriptDeserializer.Deserealize(), but even without entering inside the action is throwing an error on: "[ArgumentException: Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property. Parameter name: input] System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit) +280" I already setted all possible configs on web.config, but it seeams is being ignored by iisexpress: Can somebody help me?

partial-webconfig.rt...