SharePoint 2010: The site template requires that the Feature {e995e28b-9ba8-4668-9933-cf5c146d7a9f} be activated in the site collection

Problem

A user attempts to create a new site based upon a custom template, and then experiences the following error appearing in her browser:

Error
The site template requires that the Feature {e995e28b-9ba8-4668-9933-cf5c146d7a9f} be activated in the site collection...

Troubleshooting

1. Action: attempted to verify error by recreating it.
1. Result: successful.
2. Action: review ULS to determine event log messages associated with the error.
1. Results: found the following message:
   
   SPException thrown: Message: The site template requires that the Feature {e995e28b-9ba8-4668-9933-cf5c146d7a9f} be activated in the site collection.. Stack: at Microsoft.SharePoint.Utilities.SPUtility.ThrowSPExceptionWithTraceTag(UInt32 tagId, ULSCat traceCategory, String resourceId, Object[] resourceArgs) at Microsoft.SharePoint.SPWebTemplateElement.VerifyFeatures(XmlNodeList xmlNodeFeatures, SPWeb applyTemplateToThisWeb, Boolean checkIsFeatureActivatedInSiteCollection) at Microsoft.SharePoint.SPWebTemplateElement.VerifyFeaturesInWebTemplate(SPWeb applyTemplateToThisWeb) at Microsoft.SharePoint.SPWeb.LoadFeatureWebTemplateContent(SPFeatureWebTemplate featureWebTemplate) at Microsoft.SharePoint.SPWeb.ApplyWebTemplate(String strWebTemplate) at Microsoft.SharePoint.Solutions.AddGallery.AddGalleryWebPart.CreateSite() at Microsoft.SharePoint.Solutions.AddGallery.AddGalleryWebPart.RenderControl(HtmlTextWriter writer) at Microsoft.SharePoint.WebPartPages.SPChrome.RenderPartContents(HtmlTextWriter output, WebPart part) at Microsoft.SharePoint.WebPartPages.SPChrome.RenderWebPart(HtmlTextWriter output, WebPart part) at Microsoft.SharePoint.WebPartPages.WebPartZone.RenderZoneCell(HtmlTextWriter output, Boolean bMoreParts, WebPart part) at Microsoft.SharePoint.WebPartPages.WebPartZone.RenderWebParts(HtmlTextWriter output, ArrayList webParts) at Microsoft.SharePoint.WebPartPages.WebPartZone.Render(HtmlTextWriter output) at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) at System.Web.UI.Page.Render(HtmlTextWriter writer) at Microsoft.SharePoint.Solutions.AddGallery.AddGalleryPage.Render(HtmlTextWriter writer) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequest(HttpContext context) at ASP._layouts_addgallery_aspx.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) at System.Web.HttpApplication.PipelineStepManager.ResumeSteps(Exception error) at System.Web.HttpApplication.BeginProcessRequestNotification(HttpContext context, AsyncCallback cb) at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)
   
3. Action: searched for feature ID.
1. Result: discovered that this ID was associated with Excel Mobile Viewer Feature, which is a part of the Office Web Apps feature.
4. Action: re-activated Office Web Apps feature for site collection.  Then tested.
1. Result: able to create new site without error.

Solution

• Re-activate the Office Web Apps site collection feature.

References

• The site template requires that the Feature e995e28b-9ba8-4668-9933-cf5c146d7a9f be activated in the site collection
• SharePoint 2010 : List of Features "ID, DisplayName and Scopes"
• The Excel Mobile Viewer is not enabled in some BI site templates in SharePoint Server 2010
• Site Template requires that a Feature be implemented

Notes

• It may be possible to resolve this issue by activating the specific feature.