the push notifications feature is not activated on the site sharepoint 2013
You sometimes get the below error message when you try to use SharePoint 2013 managed client object model
"the push notifications feature is not activated on the site "
You need to the below powershell command to enable the feature related to this.
Enable-SPFeature -Identity 41e1d4bf-b1a2-47f7-ab80-d5d6cbba3092 -URL "<<site collection Url>>"
