Null Reference Exception in IdentityServer log (bug ?) #67

Hi,

I have downloaded and created a tiered MVC application as instructed on the document pages. I am using the Commecrcial ABP ... so far so good. I have changed the appsettings.json to use localdb as below. "Default": "Server=(LocalDb)\MSSQLLocalDB;Database=Kantan;Trusted_Connection=True;MultipleActiveResultSets=true" Then I start the three projects within visual studio. (HttpApi.Host, IdentityServer and Web) I created the database using Migrations beforehand without any issues.

IdentityServers gives a blank page in the browser and the following error is logged in the log file :

2020-03-25 12:14:11.119 +01:00 [INF] Executed endpoint '/Account/Login' 2020-03-25 12:14:11.471 +01:00 [INF] Entity Framework Core 3.1.0 initialized 'AbpAuditLoggingDbContext' using provider 'Microsoft.EntityFrameworkCore.SqlServer' with options: None 2020-03-25 12:14:11.810 +01:00 [INF] Executed DbCommand (13ms) [Parameters=[@p0='?' (DbType = Guid), @p1='?' (Size = 96), @p2='?' (Size = 512), @p3='?' (Size = 64), @p4='?' (Size = 64), @p5='?' (Size = 128), @p6='?' (Size = 256), @p7='?' (Size = 4000), @p8='?' (Size = 64), @p9='?' (Size = 4000), @p10='?' (DbType = Int32), @p11='?' (DbType = DateTime2), @p12='?' (Size = 4000), @p13='?' (Size = 16), @p14='?' (DbType = Int32), @p15='?' (DbType = Guid), @p16='?' (DbType = Guid), @p17='?' (DbType = Guid), @p18='?' (Size = 4000), @p19='?' (Size = 256), @p20='?' (DbType = Guid), @p21='?' (Size = 256)], CommandType='"Text"', CommandTimeout='30'] SET NOCOUNT ON; INSERT INTO [AbpAuditLogs] ([Id], [ApplicationName], [BrowserInfo], [ClientId], [ClientIpAddress], [ClientName], [Comments], [ConcurrencyStamp], [CorrelationId], [Exceptions], [ExecutionDuration], [ExecutionTime], [ExtraProperties], [HttpMethod], [HttpStatusCode], [ImpersonatorTenantId], [ImpersonatorUserId], [TenantId], [TenantName], [Url], [UserId], [UserName]) VALUES (@p0, @p1, @p2, @p3, @p4, @p5, @p6, @p7, @p8, @p9, @p10, @p11, @p12, @p13, @p14, @p15, @p16, @p17, @p18, @p19, @p20, @p21); 2020-03-25 12:14:11.882 +01:00 [DBG] Added 0 entity changes to the current audit log 2020-03-25 12:14:11.882 +01:00 [DBG] Added 0 entity changes to the current audit log 2020-03-25 12:14:11.898 +01:00 [ERR] Connection ID "17798225737568747535", Request ID "80000010-0002-f700-b63f-84710c7967bb": An unhandled exception was thrown by the application. System.NullReferenceException: Object reference not set to an instance of an object. at AspNetCore._Themes_Lepton_Components_Toolbar_LanguageSwitch_Default.ExecuteAsync() in /Themes/Lepton/Components/Toolbar/LanguageSwitch/Default.cshtml:line 5 at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context) at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, Boolean invokeViewStarts) at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context) at Microsoft.AspNetCore.Mvc.ViewComponents.ViewViewComponentResult.ExecuteAsync(ViewComponentContext context) at Microsoft.AspNetCore.Mvc.ViewComponents.DefaultViewComponentInvoker.InvokeAsync(ViewComponentContext context) at Microsoft.AspNetCore.Mvc.ViewComponents.DefaultViewComponentHelper.InvokeCoreAsync(ViewComponentDescriptor descriptor, Object arguments) at Volo.Abp.AspNetCore.Mvc.UI.Widgets.AbpViewComponentHelper.InvokeAsync(Type componentType, Object arguments) at AspNetCore._Themes_Lepton_Layouts_Account_Default.<>c__DisplayClass17_0.<<ExecuteAsync>b__7>d.MoveNext() in /Themes/Lepton/Layouts/Account/Default.cshtml:line 81 --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext.SetOutputContentAsync() at AspNetCore._Themes_Lepton_Layouts_Account_Default.<>c__DisplayClass17_0.<<ExecuteAsync>b__3>d.MoveNext() in /Themes/Lepton/Layouts/Account/Default.cshtml:line 68 --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext.SetOutputContentAsync() at AspNetCore._Themes_Lepton_Layouts_Account_Default.<>c__DisplayClass17_0.<<ExecuteAsync>b__1>d.MoveNext() in /Themes/Lepton/Layouts/Account/Default.cshtml:line 66 --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext.SetOutputContentAsync() at AspNetCore._Themes_Lepton_Layouts_Account_Default.ExecuteAsync() in /Themes/Lepton/Layouts/Account/Default.cshtml:line 34 at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context) at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, Boolean invokeViewStarts) at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderLayoutAsync(ViewContext context, ViewBufferTextWriter bodyWriter) at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context) at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, String contentType, Nullable1 statusCode) at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, String contentType, Nullable1 statusCode) 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>g__Awaited|27_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) 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 Volo.Abp.AspNetCore.Auditing.AbpAuditingMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Volo.Abp.AspNetCore.Auditing.AbpAuditingMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass5_1.<<UseMiddlewareInterface>b__1>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Localization.RequestLocalizationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.RequestLocalization.AbpRequestLocalizationMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass5_1.<<UseMiddlewareInterface>b__1>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context) at IdentityServer4.Hosting.IdentityServerMiddleware.Invoke(HttpContext context, IEndpointRouter router, IUserSession session, IEventService events) at IdentityServer4.Hosting.MutualTlsTokenEndpointMiddleware.Invoke(HttpContext context, IAuthenticationSchemeProvider schemes) at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at IdentityServer4.Hosting.BaseUrlMiddleware.Invoke(HttpContext context) at Volo.Abp.AspNetCore.MultiTenancy.MultiTenancyMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass5_1.<<UseMiddlewareInterface>b__1>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at Volo.Abp.AspNetCore.Tracing.AbpCorrelationIdMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass5_1.<<UseMiddlewareInterface>b__1>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContextOfT`1.ProcessRequestAsync() 2020-03-25 12:14:11.973 +01:00 [INF] Request finished in 8996.1172ms 500

Am I doing something wrong ?