Error While Installing a Package in sitecore 9.0.1

Question

I am getting this below error when i try to install a package in sitecore 9.0.1 with sxa 1.7

Log Error

ManagedPoolThread #2 12:19:48 ERROR One or more exceptions occurred while processing the subscribers to the 'item:saved' event.
Exception[1]: System.NullReferenceException 
Message[1]: Object reference not set to an instance of an object. 
Source[1]: Sitecore.Marketing.xMgmt 
   at Sitecore.Marketing.xMgmt.Definitions.ItemEventHandler.c__DisplayClass19_0.b__0(Guid templateId)
   at System.Linq.Enumerable.Any[TSource](IEnumerable`1 source, Func`2 predicate)
   at Sitecore.Marketing.xMgmt.Definitions.ItemEventHandler.DeployItem(Item item)
   at Sitecore.Events.Event.EventSubscribers.RaiseEvent(String eventName, Object[] parameters, EventResult result) 


ManagedPoolThread #2 12:19:48 ERROR Failed to save the item. Item ID: {C3D3D95A-EC2E-4CC1-B10D-E8C9810F90AE}, database: master
Exception: System.AggregateException
Message: One or more exceptions occurred while processing the subscribers to the 'item:saved' event.
Source: Sitecore.Kernel
   at Sitecore.Events.Event.EventSubscribers.RaiseEvent(String eventName, Object[] parameters, EventResult result)
   at Sitecore.Events.Event.RaiseEvent(String eventName, Object[] parameters)
   at Sitecore.Events.Event.RaiseItemSaved(Object sender, ItemSavedEventArgs args)
   at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   at Sitecore.Data.Engines.EngineCommand`2.RaiseEvent[TArgs](EventHandler`1 handlers, Func`2 argsCreator)
   at Sitecore.Data.Engines.EngineCommand`2.Execute()
   at Sitecore.Data.Engines.DataEngine.SaveItem(Item item)

ManagedPoolThread #2 12:19:48 ERROR Error installing items/master/sitecore/content/CBMM Global/NiobiumTech/APAC/CN/{C3D3D95A-EC2E-4CC1-B10D-E8C9810F90AE}/en/1/xml
Exception: System.AggregateException
Message: One or more exceptions occurred while processing the subscribers to the 'item:saved' event.
Source: Sitecore.Kernel
   at Sitecore.Events.Event.EventSubscribers.RaiseEvent(String eventName, Object[] parameters, EventResult result)
   at Sitecore.Events.Event.RaiseEvent(String eventName, Object[] parameters)
   at Sitecore.Events.Event.RaiseItemSaved(Object sender, ItemSavedEventArgs args)
   at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   at Sitecore.Data.Engines.EngineCommand`2.RaiseEvent[TArgs](EventHandler`1 handlers, Func`2 argsCreator)
   at Sitecore.Data.Engines.EngineCommand`2.Execute()
   at Sitecore.Data.Engines.DataEngine.SaveItem(Item item)
   at Sitecore.Pipelines.ItemProvider.SaveItem.TriggerDataEngine.Process(SaveItemArgs args)
   at (Object , Object[] )
   at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
   at Sitecore.Data.Managers.DefaultItemManager.SaveItem(Item item)
   at Sitecore.Data.Items.ItemEditing.AcceptChanges(Boolean updateStatistics, Boolean silent)
   at Sitecore.Data.Items.ItemEditing.EndEdit(Boolean updateStatistics, Boolean silent)
   at Sitecore.Install.Items.ItemInstaller.InstallItem(BehaviourOptions installOptions, Item targetItem, ItemReference item, XmlVersionParser parser, Boolean& removeVersions)
   at Sitecore.Install.Items.ItemInstaller.GetVersionInstallMode(PackageEntry entry, ItemReference reference, XmlVersionParser parser, ItemInstallerContext context, Boolean& removeVersions)
   at Sitecore.Install.Items.ItemInstaller.InstallEntry(PackageEntry entry)

ManagedPoolThread #2 12:19:49 ERROR Installation failed: System.AggregateException: One or more exceptions occurred while processing the subscribers to the 'item:saved' event.
   at Sitecore.Events.Event.EventSubscribers.RaiseEvent(String eventName, Object[] parameters, EventResult result)
   at Sitecore.Events.Event.RaiseEvent(String eventName, Object[] parameters)
   at Sitecore.Events.Event.RaiseItemSaved(Object sender, ItemSavedEventArgs args)
   at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   at Sitecore.Data.Engines.EngineCommand`2.RaiseEvent[TArgs](EventHandler`1 handlers, Func`2 argsCreator)
   at Sitecore.Data.Engines.EngineCommand`2.Execute()
   at Sitecore.Data.Engines.DataEngine.SaveItem(Item item)
   at Sitecore.Pipelines.ItemProvider.SaveItem.TriggerDataEngine.Process(SaveItemArgs args)
   at (Object , Object[] )
   at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
   at Sitecore.Data.Managers.DefaultItemManager.SaveItem(Item item)
   at Sitecore.Data.Items.ItemEditing.AcceptChanges(Boolean updateStatistics, Boolean silent)
   at Sitecore.Data.Items.ItemEditing.EndEdit(Boolean updateStatistics, Boolean silent)
   at Sitecore.Install.Items.ItemInstaller.InstallItem(BehaviourOptions installOptions, Item targetItem, ItemReference item, XmlVersionParser parser, Boolean& removeVersions)
   at Sitecore.Install.Items.ItemInstaller.GetVersionInstallMode(PackageEntry entry, ItemReference reference, XmlVersionParser parser, ItemInstallerContext context, Boolean& removeVersions)
   at Sitecore.Install.Items.ItemInstaller.InstallEntry(PackageEntry entry)
   at Sitecore.Install.Items.ItemInstaller.Flush()
   at Sitecore.Install.Framework.SinkDispatcher.Flush()
   at Sitecore.Install.Utils.EntrySorter.Flush()
   at Sitecore.Install.Zip.PackageReader.Populate(ISink`1 sink)
   at Sitecore.Install.Utils.EntrySorter.Populate(ISink`1 sink)
   at Sitecore.Install.Installer.InstallPackage(String path, Boolean registerInstallation, ISource`1 source, IProcessingContext context)
   at Sitecore.Install.Installer.InstallPackage(String path, IProcessingContext context)
   at Sitecore.Shell.Applications.Install.Dialogs.InstallPackage.InstallPackageForm.AsyncHelper.b__8_0()
   at Sitecore.Shell.Applications.Install.Dialogs.InstallPackage.InstallPackageForm.AsyncHelper.CatchExceptions(ThreadStart start)

Answer 1

This is not SXA related. I had similar problems on a non-SXA setup. I was able to install the package by commenting the events section in the following config:

Website\App_Config\Sitecore\Marketing.Operations.xMgmt\Sitecore.Marketing.config

I had to do this for most Sitecore instances, that I upgraded to a newer Sitecore version when installing old content.