It seems that YAF don't work in a folder anymore.
Unable to Locate Provider Named "System.Data.SqlClient" in Data Access Providers (DLL Not Located in Bin Directory?).
[NoValidDbAccessProviderFoundException: Unable to Locate Provider Named "System.Data.SqlClient" in Data Access Providers (DLL Not Located in Bin Directory?).]
YAF.Core.Data.DbAccessProvider.<.ctor>b__0() +312
YAF.Core.Helpers.SafeReadWriteProvider1.get_Instance() +87 YAF.Core.Data.DbAccessProvider.get_Instance() +41 YAF.Core.BaseModule.<RegisterDataBindings>b__4(IComponentContext c) +74 Autofac.<>c__DisplayClass10
1.b__f(IComponentContext c, IEnumerable1 p) +47 Autofac.Builder.<>c__DisplayClass1
1.b__0(IComponentContext c, IEnumerable1 p) +59 Autofac.Core.Activators.Delegate.DelegateActivator.ActivateInstance(IComponentContext context, IEnumerable
1 parameters) +191
Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable1 parameters) +109 Autofac.Core.Resolving.InstanceLookup.Execute() +158 Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable
1 parameters) +282
Autofac.Core.Resolving.InstanceLookup.ResolveComponent(IComponentRegistration registration, IEnumerable1 parameters) +72 Autofac.Core.Activators.Reflection.<>c__DisplayClass2.<CanSupplyValue>b__0() +82 Autofac.Core.Activators.Reflection.ConstructorParameterBinding.Instantiate() +233 Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance(IComponentContext context, IEnumerable
1 parameters) +563
Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable1 parameters) +109 Autofac.Core.Resolving.InstanceLookup.Execute() +158 Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable
1 parameters) +282
Autofac.Core.Resolving.InstanceLookup.ResolveComponent(IComponentRegistration registration, IEnumerable1 parameters) +72 Autofac.Core.Activators.Reflection.<>c__DisplayClass2.<CanSupplyValue>b__0() +82 Autofac.Core.Activators.Reflection.ConstructorParameterBinding.Instantiate() +233 Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance(IComponentContext context, IEnumerable
1 parameters) +563
Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable1 parameters) +109 Autofac.Core.Resolving.InstanceLookup.<Execute>b__0() +63 Autofac.Core.Lifetime.LifetimeScope.GetOrCreateAndShare(Guid id, Func
1 creator) +201
Autofac.Core.Resolving.InstanceLookup.Execute() +262
Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable1 parameters) +282 Autofac.Core.Resolving.InstanceLookup.ResolveComponent(IComponentRegistration registration, IEnumerable
1 parameters) +72
Autofac.Features.Collections.<>c__DisplayClass6.b__1(IComponentRegistration cr) +60
System.Linq.WhereSelectArrayIterator2.MoveNext() +66 System.Linq.Buffer
1..ctor(IEnumerable1 source) +335 System.Linq.Enumerable.ToArray(IEnumerable
1 source) +77
Autofac.Features.Collections.<>c__DisplayClass4.b__0(IComponentContext c, IEnumerable1 p) +251 Autofac.Core.Activators.Delegate.DelegateActivator.ActivateInstance(IComponentContext context, IEnumerable
1 parameters) +191
Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable1 parameters) +109 Autofac.Core.Resolving.InstanceLookup.Execute() +158 Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable
1 parameters) +282
Autofac.Core.Resolving.ResolveOperation.ResolveComponent(IComponentRegistration registration, IEnumerable1 parameters) +60 Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable
1 parameters) +73
[DependencyResolutionException: An exception was thrown while executing a resolve operation. See the InnerException for details. ---> Unable to Locate Provider Named "System.Data.SqlClient" in Data Access Providers (DLL Not Located in Bin Directory?). (See inner exception for details.)]
Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable1 parameters) +177 Autofac.Core.Lifetime.LifetimeScope.ResolveComponent(IComponentRegistration registration, IEnumerable
1 parameters) +279
Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable1 parameters, Object& instance) +175 Autofac.ResolutionExtensions.ResolveService(IComponentContext context, Service service, IEnumerable
1 parameters) +250
Autofac.ResolutionExtensions.Resolve(IComponentContext context, Type serviceType, IEnumerable1 parameters) +72 Autofac.ResolutionExtensions.Resolve(IComponentContext context, IEnumerable
1 parameters) +118
Autofac.ResolutionExtensions.Resolve(IComponentContext context) +85
YAF.Core.BaseModule.b__2c(IComponentContext x) +69
Autofac.<>c__DisplayClass101.<Register>b__f(IComponentContext c, IEnumerable
1 p) +47
Autofac.Builder.<>c__DisplayClass11.<ForDelegate>b__0(IComponentContext c, IEnumerable
1 p) +59
Autofac.Core.Activators.Delegate.DelegateActivator.ActivateInstance(IComponentContext context, IEnumerable1 parameters) +191 Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable
1 parameters) +109
Autofac.Core.Resolving.InstanceLookup.b__0() +63
Autofac.Core.Lifetime.LifetimeScope.GetOrCreateAndShare(Guid id, Func1 creator) +201 Autofac.Core.Resolving.InstanceLookup.Execute() +262 Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable
1 parameters) +282
Autofac.Core.Resolving.ResolveOperation.ResolveComponent(IComponentRegistration registration, IEnumerable1 parameters) +60 Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable
1 parameters) +111
Autofac.Core.Lifetime.LifetimeScope.ResolveComponent(IComponentRegistration registration, IEnumerable1 parameters) +279 Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable
1 parameters, Object& instance) +175
Autofac.ResolutionExtensions.ResolveService(IComponentContext context, Service service, IEnumerable1 parameters) +250 Autofac.ResolutionExtensions.Resolve(IComponentContext context, Type serviceType, IEnumerable
1 parameters) +72
Autofac.ResolutionExtensions.Resolve(IComponentContext context, Type serviceType) +47
YAF.Core.AutoFacServiceLocatorProvider.Get(Type serviceType) +74
YAF.Types.Interfaces.IServiceLocatorExtensions.Get(IServiceLocator serviceLocator) +131
YAF.Types.Interfaces.IServiceLocatorExtensions.Get(IHaveServiceLocator haveLocator) +118
YAF.Core.UnloadSessionForumModule.UnloadSessionModule_Unload(Object sender, EventArgs e) +56
System.Web.UI.Control.OnUnload(EventArgs e) +9695598
YAF.Forum.OnUnload(EventArgs e) +41
System.Web.UI.Control.UnloadRecursive(Boolean dispose) +237
System.Web.UI.Control.UnloadRecursive(Boolean dispose) +173
System.Web.UI.Control.UnloadRecursive(Boolean dispose) +173
System.Web.UI.Page.UnloadRecursive(Boolean dispose) +23
System.Web.UI.Page.ProcessRequestCleanup() +56
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +245
System.Web.UI.Page.ProcessRequest() +72
System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
System.Web.UI.Page.ProcessRequest(HttpContext context) +58
ASP.forums_default_aspx.ProcessRequest(HttpContext context) in c:\Users\Vladimir\AppData\Local\Temp\Temporary ASP.NET Files\root\958c4e54\6e15e1fe\App_Web_no4wl45u.5.cs:0
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +341
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69
How to repeat - put YAF into folder in a simple test solution.