When I launch my Central Administration site, I'm getting the following
exception

We upgraded to B2TR two weeks ago, and everything has been smooth. Not
sure what could be causing this?

Thank you

[NullReferenceException: Object reference not set to an instance of an
object.]
Microsoft.SharePoint.Upgrade.SPDatabaseSequence.GetVersion(Guid id,
Version defaultVersion, SqlSession session, SPDatabaseSequence
sequence) +1173

Microsoft.SharePoint.Administration.SPContentDatabase.ValidateDatabaseSchemaCompatibility()
+513
Microsoft.SharePoint.SPSite.PreinitializeServer(SPRequest request)
+50
Microsoft.SharePoint.SPWeb.InitializeSPRequest() +222
Microsoft.SharePoint.SPWeb.EnsureSPRequest() +51
Microsoft.SharePoint.SPWeb.get_Request() +44
Microsoft.SharePoint.SPWeb.GetWebPartPageContent(Uri pageUrl,
PageView requestedView, HttpContext context, Boolean forRender, Boolean
includeHidden, Boolean mainFileRequest, Boolean
fetchDependencyInformation, Boolean& ghostedPage, Byte& verGhostedPage,
String& siteRoot, Guid& siteId, Int64& bytes, Guid& docId, UInt32&
docVersion, String& timeLastModified, Byte& level, Object&
buildDependencySetData, UInt32& dependencyCount, Object&
buildDependencies, SPWebPartCollectionInitialState& initialState,
Object& oMultipleMeetingDoclibRootFolders, String& redirectUrl,
Boolean& ObjectIsList, Guid& listId) +1252

Microsoft.SharePoint.ApplicationRuntime.SPRequestModuleData.FetchWebPartPageInformationForInit(HttpContext
context, SPWeb spweb, Boolean mainFileRequest, String path, Boolean
impersonate, Boolean& fGhostedPage, Byte& verGhostedPage, Guid& docId,
UInt32& docVersion, String& timeLastModified, SPFileLevel& spLevel,
String& masterPageUrl, String& customMasterPageUrl, String& webUrl,
String& siteUrl, Guid& siteId, Object& buildDependencySetData,
SPWebPartCollectionInitialState& initialState, String& siteRoot,
String& redirectUrl, Object& oMultipleMeetingDoclibRootFolders,
Boolean& objectIsList, Guid& listId, Int64& bytes) +692

Microsoft.SharePoint.ApplicationRuntime.SPRequestModuleData.GetFileForRequest(HttpContext
context, SPWeb web, Boolean exclusion, String virtualPath) +210

Microsoft.SharePoint.ApplicationRuntime.SPRequestModule.InitContextWeb(HttpContext
context, SPWeb web) +79

Microsoft.SharePoint.WebControls.SPControl.SPWebEnsureSPControl(HttpContext
context) +336
Microsoft.SharePoint.WebControls.SPControl.GetContextWeb(HttpContext
context) +25

Microsoft.SharePoint.ApplicationRuntime.SPRequestModule.PostResolveRequestCacheHandler(Object
oSender, EventArgs ea) +322

System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+92
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously) +64