A quick one from the field.
You may occasionally run into the behaviour that the site content and structure will display an unknown error and a correlation ID on access.
If you see something like this in the ULS logs :
System.ArgumentException: Invalid value.
The value cannot be an empty string. Parameter name: stringId at
Microsoft.SharePoint.Publishing.CommonUtilities.ConfirmNotNullOrEmptyString(String value, String parameterName) at
Microsoft.SharePoint.Publishing.Internal.WebControls.ToolbarViewSelectionDropdown.AddMenuItem(String itemId, ListItem itemTitleDesc, String itemOnClickScript, Boolean checkMenuItem) at
Microsoft.SharePoint.Publishing.Internal.WebControls.ToolbarViewSelectionDropdown.CreateChildControls()
it might be a good idea to check if your list at /weburl/Reports List (Content And Structure Reports list) doesn’t have items that lack the Title or Description.
More: https://blogs.msdn.microsoft.com/ecm/2006/11/15/report-rapport-in-moss-2007/
you will say : “Wait ! this is soooooo old !”
Yes. It still applies.