Error getting value from 'Items' on 'AutoMapper.ResolutionContext'.

[Ben Wong]

Hi, I'm getting a strange error with AutoMapper. I hope somebody can tell me what's going on by looking at the stack trace. The mystery is that the response was always sent w/o a problem. Furthermore, the below stack trace is actually from a test after I had replaced all instances of mapper.Map with manual mapping. Nothing seemed to change. Part of me was starting to wonder whether Newtonsoft used Automapper internally, but I was a bit skeptical that something like this would have gone unaddressed.
The project is ASP.NET Core 3, and the AutoMapper.Extensions.Microsoft.DependencyInjection pkg is v7.0.0.

Will the below exception occur if I have a profile set up wrong? As mentioned, this was copied from a test where no profiles were actually being used, and when they were in effect, the response seemed to work anyway! I am nevertheless, concerned that I may have some underlying issue present.

Thanks for any help you can give!

fail: Microsoft.AspNetCore.Server.IIS.Core.IISHttpServer[2]

      Connection ID "18374686511347007497", Request ID "8000000d-0007-ff00-b63f-84710c7967bb": An unhandled exception was thrown by the application.

Newtonsoft.Json.JsonSerializationException: Error getting value from 'Items' on 'AutoMapper.ResolutionContext'.

 ---> System.InvalidOperationException: You must use a Map overload that takes Action<IMappingOperationOptions>!

   at AutoMapper.ResolutionContext.CheckDefault()

   at AutoMapper.ResolutionContext.get_Items()

   at Newtonsoft.Json.Serialization.ExpressionValueProvider.GetValue(Object target)

   --- End of inner exception stack trace ---

   at Newtonsoft.Json.Serialization.ExpressionValueProvider.GetValue(Object target)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CalculatePropertyValues(JsonWriter writer, Object value, JsonContainerContract contract, JsonProperty member, JsonProperty property, JsonContract& memberContract, Object& memberValue)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeDictionary(JsonWriter writer, IDictionary values, JsonDictionaryContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)

   at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)

   at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value)

   at Newtonsoft.Json.Linq.JToken.FromObjectInternal(Object o, JsonSerializer jsonSerializer)

   at Newtonsoft.Json.Linq.JObject.FromObject(Object o, JsonSerializer jsonSerializer)

   at Audit.Core.Providers.FileDataProvider.SaveFileAsync(String fullPath, AuditEvent auditEvent)

   at Audit.Core.Providers.FileDataProvider.InsertEventAsync(AuditEvent auditEvent)

   at Audit.Core.AuditScope.SaveEventAsync(Boolean forceInsert)

   at Audit.Core.AuditScope.EndAsync()

   at Audit.Core.AuditScope.DisposeAsync()

   at Audit.Mvc.AuditAttribute.AfterResultAsync(ResultExecutedContext filterContext)

   at Audit.Mvc.AuditAttribute.OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next)

   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResultFilterAsync>g__Awaited|29_0[TFilter,TFilterAsync](ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)

   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context)

   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)

   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()

--- End of stack trace from previous location where exception was thrown ---

   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)

   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)

   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)

   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)

   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

   at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContextOfT`1.ProcessRequestAsync()