Azure DevOps 2019 Web portal 500 error

[Madison.Wu]

TF53010: The following error has occurred in an Azure DevOps component or extension:
Date (UTC): 4/10/2019 2:06:28 AM
Machine: *
Application Domain: /LM/W3SVC/2/ROOT/tfs-28-131993267214787002
Assembly: Microsoft.TeamFoundation.Framework.Server, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a; v4.0.30319
Service Host: fb9e841e-0252-4ef4-88c1-213f5aa6d28e (TEAM FOUNDATION)
Process Details:
Process Name: w3wp
Process Id: 12028
Thread Id: 9424
Account name: *
Detailed Message: TF30065: An unhandled exception occurred.
Web Request Details
Url: http://*:8080/tfs [method: GET]
User Agent: Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36
Headers: not available
Path: /tfs
Local Request: True
Host Address: 3.102.192.12
User: * [authentication type: Negotiate]

Exception Message: Object reference not set to an instance of an object. (type NullReferenceException)
Exception Stack Trace: at Microsoft.VisualStudio.Services.ExtensionManagement.Sdk.Plugins.LocalContributionSource.QueryProviders(IVssRequestContext requestContext)
at Microsoft.VisualStudio.Services.ExtensionManagement.Sdk.Server.ContributionService.GetContributionHierarchy(IVssRequestContext requestContext)
at Microsoft.VisualStudio.Services.ExtensionManagement.Sdk.Server.ContributionService.QueryContributionsForType(IVssRequestContext requestContext, String contributionTypeId)
at Microsoft.VisualStudio.Services.ExtensionManagement.Sdk.Server.ContributionService.QueryContributionsForType[T](IVssRequestContext requestContext, String contributionType, String associatedDataName, IEnumerable`1& contributions, T& associatedData)
at Microsoft.VisualStudio.Services.ExtensionManagement.Sdk.Server.FeatureManagement.ContributedFeatureService.GetFeaturesLookup(IVssRequestContext requestContext)
at Microsoft.VisualStudio.Services.ExtensionManagement.Sdk.Server.FeatureManagement.ContributedFeatureService.GetFeatureClaims(IVssRequestContext requestContext)
at Microsoft.VisualStudio.Services.ExtensionManagement.Sdk.Server.ContributionClaimService.GetClaimsInternal(IVssRequestContext requestContext)
at Microsoft.VisualStudio.Services.ExtensionManagement.Sdk.Server.ContributionClaimService.HasClaim(IVssRequestContext requestContext, String claim)
at Microsoft.TeamFoundation.Server.WebAccess.TfsMailSettings..ctor(IVssRequestContext requestContext)
at Microsoft.TeamFoundation.Server.WebAccess.ConfigurationContext..ctor(IVssRequestContext tfsRequestContext, RequestContext requestContext)
at Microsoft.TeamFoundation.Server.WebAccess.PageContext..ctor(WebContext webContext)
at Microsoft.TeamFoundation.Server.WebAccess.WebAccessModule.CreatePageContext(RequestContext requestContext)
at Microsoft.TeamFoundation.Server.WebAccess.WebContextFactory.GetPageContext(RequestContext requestContext, Boolean create)
at ASP._views_shared_main_master.__Render__control1(HtmlTextWriter __w, Control parameterContainer)
at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
at System.Web.Mvc.ViewPage.Render(HtmlTextWriter writer)
at Microsoft.TeamFoundation.Server.WebAccess.TfsViewPage`1.Render(HtmlTextWriter writer)
at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
at Microsoft.TeamFoundation.Server.WebAccess.TfsViewPage`1.RenderControl(HtmlTextWriter writer)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

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