Error

Unable to connect to database.  Check database connection information and make sure the database server is running.
   at Microsoft.SharePoint.Library.SPRequest.PreInitServer(String bstrAbsoluteRequestUrl, String bstrServerRelativeUrl, Int32 lZone, Guid gApplicationId, Guid gSiteId, Guid gDatabaseId, String bstrDatabaseServer, String bstrDatabaseName, String bstrDatabaseUsername, String bstrDatabasePassword, Boolean fHostHeaderIsSiteName)
   at Microsoft.SharePoint.SPSite.PreinitializeServer(SPRequest request)
   at Microsoft.SharePoint.SPWeb.InitializeSPRequest()
   at Microsoft.SharePoint.SPWeb.EnsureSPRequest()
   at Microsoft.SharePoint.SPWeb.get_Request()
   at Microsoft.SharePoint.SPWeb.GetProperties()
   at Microsoft.SharePoint.Utilities.SPPropertyBag..ctor(GetProperties getProperties, UpdateProperties updateProperties)
   at Microsoft.SharePoint.SPWeb.get_Properties()
   at Volvo.CWP.SharePoint.SPWebExtensions.PropertyBag(SPWeb web, String key, String& value, String defaultValue)
   at Volvo.CWP.SharePoint.SPWebExtensions.PropertyBag(SPWeb web, String key, String defaultValue)
   at Volvo.CWP.SharePoint.Applications.Internet.CodeBehind.InternetMasterPage.get_HtmlLanguage()
   at ASP.MAIN_DLR_MASTER_484315784.__Render__control1(HtmlTextWriter __w, Control parameterContainer)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Page.Render(HtmlTextWriter writer)
   at Volvo.CWP.SharePoint.Applications.Internet.CodeBehind.InternetPublishingPage.Render(HtmlTextWriter writer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)