Sitecore Experience Accelerator (SXA) Installation Error

Question

The following error is occurring during installation of Sitecore Experience Accelerator (v 1.6 rev 180103) to Sitecore 9.0 (Update 1, rev. 17219).

    4352 18:13:38 ERROR xDB unavailable when submitting contact.
Exception: Sitecore.Analytics.DataAccess.XdbUnavailableException
Message: xDB unavailable
Source: Sitecore.Analytics.XConnect
   at Sitecore.Analytics.XConnect.DataAccess.XConnectDataAdapterProvider.ExecuteWithExceptionHandling[T](Func`2 func)
   at Sitecore.Analytics.XConnect.DataAccess.XConnectDataAdapterProvider.<>c__DisplayClass15_0.<LoadContact>b__0()
   at Sitecore.Analytics.XConnect.Diagnostics.PerformanceCounters.OperationPerformanceMonitorExtensions.Monitor[T](OperationPerformanceMonitorBase monitor, Func`1 operation)
   at Sitecore.Analytics.Data.ContactRepository.LoadContact(ID contactId)
   at Sitecore.Analytics.Data.ContactRepository.MergeTemporaryContact(Contact contact)
   at Sitecore.Analytics.Data.ContactRepository.SaveContact(Contact contact)
   at Sitecore.Analytics.Tracking.ContactManager.SubmitContact(Contact contact, Contact& realContact)

Nested Exception

Exception: Sitecore.XConnect.XdbCollectionUnavailableException
Message: An error occurred while sending the request.
Source: Sitecore.Xdb.Common.Web
   at Sitecore.Xdb.Common.Web.Synchronous.SynchronousExtensions.SuspendContextLock[TResult](Func`1 taskFactory)
   at Sitecore.XConnect.Client.XConnectSynchronousExtensions.SuspendContextLock[TResult](Func`1 taskFactory)
   at Sitecore.XConnect.Client.XConnectSynchronousExtensions.Get[TEntity](IXdbContext context, IEntityReference`1 reference, ExpandOptions expandOptions, TimeSpan timeout)
   at Sitecore.Analytics.XConnect.DataAccess.XConnectDataAdapterProvider.GetContactByIdentifier(IXdbContext xdbContext, String source, String identifier)
   at Sitecore.Analytics.XConnect.DataAccess.XConnectDataAdapterProvider.ExecuteWithExceptionHandling[T](Func`2 func)

Nested Exception

Exception: Sitecore.Xdb.Common.Web.ConnectionTimeoutException
Message: A task was canceled.
Source: Sitecore.Xdb.Common.Web
   at Sitecore.Xdb.Common.Web.CommonWebApiClient`1.<ExecuteAsync>d__37.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.XConnect.Client.WebApi.CollectionBatchWebApiClient.<ExecuteBatch>d__11.MoveNext()

Nested Exception

Exception: System.Threading.Tasks.TaskCanceledException
Message: A task was canceled.
Source: mscorlib
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.Xdb.Common.Web.CommonWebApiClient`1.<ExecuteAsync>d__37.MoveNext()

Answer 1

Check XDB Database installed successfully before installing SXA.