Unable to read beyond the end of the stream is message

Topics: SharpMap v0.9 / v1.x, SharpMap v2.0, Web Controls
Aug 5, 2007 at 3:54 AM

i have error at code :
myMap.ZoomToExtents();

Unable to read beyond the end of the stream is message

i need help
i think when run at
string path = Server.MapPath(@"~\App_data\countries.shp");
layCountries.DataSource = new SharpMap.Data.Providers.ShapeFile(path , true);

that is error
Unable to read beyond the end of the stream