I have the following code inside my Event Receiver, to copy a file from a document library named “Templates” to a sub-folder inside our “Shared documents” library

    SPDocumentLibrary template = (SPDocumentLibrary)properties.Web.GetList(properties.Web.ServerRelativeUrl + "/OrderTemplates/");     SPDocumentLibrary projectid = (SPDocumentLibrary)properties.Web.GetList(properties.Web.ServerRelativeUrl + "/Shared Documents/"+properties.ListItemId+"/");     SPListItem softemplete = null;     foreach (SPListItem i in template.Items)         {             if (i.Name.ToLower().Contains("pof draft"))                 {                     softemplete = i;                  }         }     byte[] fileBytes = softemplete.File.OpenBinary();     string destUrl = projectid.RootFolder.Url + "/" + properties.ListItemId + "/Order Final";     SPFile destFile = projectid.RootFolder.Files.Add(destUrl, fileBytes, true); 

now the above code will work well, till the last line:-

SPFile destFile = projectid.RootFolder.Files.Add(destUrl, fileBytes, true);

which will raise an exception as follow:-

The URL 'Shared Documents/113/Order Final' is invalid. It may refer to a nonexistent file or folder, or refer to a valid file or folder that is not in the current Web. 

although the URL Shared Documents/113/Order Final should be valid, as i have a folder named 113 and under it there is a sub folder named Order Final as follow, where the below url is valid:-

http://servername/PM/Shared Documents/113/Order Final 

so not sure why i am getting the exception, that the url is not valid??