Unable to process the server's response because it lacked a required HTTP header. This may be because the server requires user credentials but did not specify which authentication method to use. Confirm with your system administrator that the Web server allows at least one authentication method.
Unable to perform the operation. The operation refers to items that may not exist in the workbook, may not have been marked ...
Unable to perform the requested action because of communication issues. Check that you are still connected to the Internet ...
Unable to persist changes to the search application object due to a previous error persisting changes. See event log for ...
Unable to process request. Subsites have been created since you last accessed this site. Refresh your view and try again. ...
Unable to process the server's response because it lacked a required HTTP header. This may be because the server requires ...
Unable to provision profile page because the external content type with name '{0}' in namespace '{1}' has no valid specific ...
Unable to publish one or more resources to the tasks list because the resource assigned to the task does not exist on the ...
Unable to publish resource \"^1\" to the tasks list because the resource does not exist on the SharePoint server.}The resource ...
Unable to publish this post. Most likely causes include you are not connected to the internet, your provider is unavailable, ...