This article will guide you how to resolve a virtualPath issue that may appear in SharePoint 2013 when trying to add a 3rd party library (for example SignalR), or when you use the “~” symbol in the path. We encountered this issue while developing a plugin that allows you to integrate the GroupDocs.Annotation for .NET library into SharePoint. Overall, the issue is quite strange, as it is not reported in the stack trace or logs....Mappath("~/testFolder/page.aspx")). To resolve the issue...