Getting error parameter not valid during upload using ImageResizer??

hi,

I am using ImageResizer but getting the error below
The code is within Createduser Event  and on Aspx page is a Create User Wizard


Code Behind

        foreach (string fileKey in HttpContext.Current.Request.Files.Keys)         {             HttpPostedFile file = HttpContext.Current.Request.Files[fileKey];             if (file.ContentLength <= 0) continue; //Skip unused file controls.             ImageResizer.ImageJob i = new ImageResizer.ImageJob(file, "~/PlayMeImage1/<guid>.<ext>", new ImageResizer.ResizeSettings("width=100;height=100;format=jpg;mode=crop&q ...