Creative exchange object null reference error

Question

We have upgraded to Sitecore 10.1 from Sitecore 8.2. The Creative Exchange feature is giving object null reference error in web database when creating a new site using powershell script.

How to reproduce the error.

1. Create a new sxa site
2. Check the Creative Exchange under modules

3. Publish the new site to web database.
4. Open the Home item of new created website in the web database and object null reference error will appear.

The error only appears when a new sxa site is created with Creative Exchange module.

[NullReferenceException: Object reference not set to an instance of an object.]
   Sitecore.XA.Foundation.Theming.ThemingContext.GetThemeItem(Item item, DeviceItem device) +143
   Sitecore.XA.Feature.CreativeExchange.Commands.CreativeExchangeCommandBase.QueryState(CommandContext context) +315
   Sitecore.Shell.Framework.Commands.CommandManager.QueryState(Command command, CommandContext context) +36
   Sitecore.Web.UI.WebControls.Ribbons.Ribbon.FillParamsFromCommand(CommandContext commandContext, RibbonCommandParams ribbonCommandParams) +220
   Sitecore.Web.UI.WebControls.Ribbons.Ribbon.GetCommandParameters(Item controlItem, CommandContext commandContext) +78
   Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderLargeButton(HtmlTextWriter output, Item button, CommandContext commandContext) +77
   Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderButton(HtmlTextWriter output, Item button, CommandContext commandContext) +439
   Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderChunk(HtmlTextWriter output, Item chunk, CommandContext commandContext) +347
   Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderChunk(HtmlTextWriter output, Item chunk, CommandContext commandContext, Boolean isContextual, String id) +243
   Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderChunk(HtmlTextWriter output, Item chunk, CommandContext commandContext, Boolean isContextual) +160
   Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderChunks(HtmlTextWriter output, Item strip, CommandContext commandContext, Boolean isContextual) +431
   Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderStrips(HtmlTextWriter output, Item ribbon, Boolean isContextual, ListString visibleStripList) +1621
   Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderStrips(HtmlTextWriter output, Item defaultRibbon, Item contextualRibbon, ListString visibleStripList) +161
   Sitecore.Web.UI.WebControls.Ribbons.Ribbon.Render(HtmlTextWriter output) +739
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +131
   Sitecore.Web.HtmlUtil.RenderControl(Control ctl) +79
   Sitecore.Shell.Applications.ContentManager.ContentEditorForm.UpdateRibbon(Item folder, Boolean isCurrentItemChanged, Boolean showEditor) +559
   Sitecore.Shell.Applications.ContentManager.ContentEditorForm.Update() +581
   Sitecore.Shell.Applications.ContentManager.ContentEditorForm.OnPreRendered(EventArgs e) +191

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) +0
   System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) +132
   System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +146
   Sitecore.Reflection.ReflectionUtil.InvokeMethod(MethodInfo method, Object[] parameters, Object obj) +89
   Sitecore.Shell.Applications.ContentManager.ContentEditorPage.OnPreRender(EventArgs e) +143
   System.Web.UI.Control.PreRenderRecursiveInternal() +200
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +7479

Has anyone encountered this issue?

Thanks in advance .

Answer 1

GetThemeItem method is dependant on theme mode item with ID {79C7FE02-185A-4576-B5A8-5B0AC10DB0CB}. Make sure this item is published.