Problem with EPiServer Languages add-on

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PM> Install-Package EPiServer.Labs.LanguageManager Attempting to resolve dependency 'EPiServer.Packaging (≥ 3.2.0 && < 4.0)'. Attempting to resolve dependency 'EPiServer.Framework (≥ 7.15.0 && < 8.0)'. Attempting to resolve dependency 'Newtonsoft.Json (≥ 5.0.8 && < 7.0)'. Attempting to resolve dependency 'Microsoft.AspNet.Mvc (≥ 4.0.20710.0 && < 6.0)'. Attempting to resolve dependency 'Microsoft.AspNet.WebPages (≥ 3.2.2 && < 3.3.0)'. Attempting to resolve dependency 'Microsoft.Web.Infrastructure (≥ 1.0.0.0)'. Attempting to resolve dependency 'Microsoft.AspNet.Razor (≥ 3.2.2 && < 3.3.0)'. Attempting to resolve dependency 'structuremap (≥ 2.6.4.1 && < 3.0)'. Attempting to resolve dependency 'Nuget.Core (≥ 2.5 && < 2.8)'. Attempting to resolve dependency 'EPiServer.CMS.Core (≥ 7.5 && < 8.0)'. Attempting to resolve dependency 'EPiServer.Logging.Log4Net (< 2.0)'. Attempting to resolve dependency 'log4net (= 1.2.10)'. Attempting to resolve dependency 'Castle.Windsor (≥ 3.2 && < 4.0)'. Attempting to resolve dependency 'Castle.Core (≥ 3.2.0)'. Attempting to resolve dependency 'EPiServer.CMS.UI (≥ 7.5 && < 8.0)'. Attempting to resolve dependency 'EPiServer.CMS.UI.Core (= 7.17.0)'. Attempting to resolve dependency 'DotNetZip (= 1.9.1.8)'. Installing 'EPiServer.Labs.LanguageManager 1.1.1.7514'. Successfully installed 'EPiServer.Labs.LanguageManager 1.1.1.7514'. Adding 'EPiServer.Labs.LanguageManager 1.1.1.7514' to Demo2. Successfully added 'EPiServer.Labs.LanguageManager 1.1.1.7514' to Demo2.

http://localhost:52901/EPiServer/EPiServer.Labs.LanguageManager/Stores/language/null Failed to load resource: the server responded with a status of 500 (Internal Server Error) dojo.js:15 _317: Unable to load /EPiServer/EPiServer.Labs.LanguageManager/Stores/language/null status: 500 http://localhost:52901/EPiServer/EPiServer.Labs.LanguageManager/Stores/language/null Failed to load resource: the server responded with a status of 500 (Internal Server Error) dojo.js:15 _317: Unable to load /EPiServer/EPiServer.Labs.LanguageManager/Stores/language/null status: 500message: "Unable to load /EPiServer/EPiServer.Labs.LanguageManager/Stores/language/null status: 500"response: ObjectresponseText: " ↵ ↵ ↵ Unable to cast object of type 'System.Web.Security.RolePrincipal' to type 'EPiServer.Security.VirtualRolePrincipal'. ↵ ↵ ↵ ↵ ↵ ↵ ↵ Server Error in '/' Application. ↵ ↵ Unable to cast object of type 'System.Web.Security.RolePrincipal' to type 'EPiServer.Security.VirtualRolePrincipal'. ↵ ↵ ↵ ↵ Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. ↵ ↵ ↵ ↵ Exception Details: System.InvalidCastException: Unable to cast object of type 'System.Web.Security.RolePrincipal' to type 'EPiServer.Security.VirtualRolePrincipal'. ↵ ↵ Source Error: ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. ↵ ↵ ↵ ↵ ↵ ↵ Stack Trace: ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵[InvalidCastException: Unable to cast object of type 'System.Web.Security.RolePrincipal' to type 'EPiServer.Security.VirtualRolePrincipal'.] ↵ EPiServer.Labs.LanguageManager.Controllers.LanguageStore.IsCurrentUserInAdminRole() +36 ↵ lambda_method(Closure , ControllerBase , Object[] ) +62 ↵ System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +14 ↵ System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +157 ↵ System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27 ↵ System.Web.Mvc.<>c__DisplayClass15.b__12() +56 ↵ System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +256 ↵ System.Web.Mvc.<>c__DisplayClass17.b__14() +22 ↵ System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +256 ↵ System.Web.Mvc.<>c__DisplayClass17.b__14() +22 ↵ System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +190 ↵ System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +522 ↵ EPiServer.Shell.Services.Rest.RestControllerBase.ExecuteCore() +175 ↵ System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +181 ↵ System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10 ↵ EPiServer.Shell.Services.Rest.RestHttpHandler.ProcessRequest(HttpContextBase httpContext) +197 ↵ EPiServer.Shell.Services.Rest.RestHttpHandler.ProcessRequest(HttpContext context) +42 ↵ System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +341 ↵ System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69 ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.5.22.0 ↵ ↵ ↵ ↵ ↵ ↵"stack: (...)get stack: function () { [native code] }set stack: function () { [native code] }status: 500xhr: XMLHttpRequest__proto__: TMPdojo.js:15 _498dojo.js:15 (anonymous function)dojo.js:15 _2cddojo.js:15 _2cbdojo.js:15 reject.errbackdojo.js:15 _2cddojo.js:15 _2cbdojo.js:15 reject.errbackdojo.js:15 (anonymous function)dojo.js:15 _2f2dojo.js:15 _2ecdojo.js:15 _30a.rejectdojo.js:15 _2f8dojo.js:15 _2f2dojo.js:15 _2ecdojo.js:15 _30a.rejectdojo.js:15 _2f8dojo.js:15 _2f2dojo.js:15 _2ecdojo.js:15 _30a.rejectdojo.js:15 _2f8dojo.js:15 _2f2dojo.js:15 _2ecdojo.js:15 _30a.rejectdojo.js:15 _2f8dojo.js:15 _2f2dojo.js:15 _2ecdojo.js:15 _30a.rejectdojo.js:15 _4f2dojo.js:15 _4fe :55930/e635aa06cd254720b61b01108f3d4369/browserLink:37 Setting 'XMLHttpRequest.withCredentials' for synchronous requests is deprecated.

[InvalidCastException: Unable to cast object of type 'System.Web.Security.RolePrincipal' to type 'EPiServer.Security.VirtualRolePrincipal'.] EPiServer.Labs.LanguageManager.Controllers.LanguageStore.IsCurrentUserInAdminRole()