GDI+ error #19

using (var img = Image.FromFile(srcImagePath))
 {
 FileInfo exportedFileInfo = new FileInfo(srcImagePath);
 tempoImagePath = Path.Combine(_hostingEnvironment.WebRootPath , cacheDirectory) + "//" + watermark.Id + StaticVariables.CharacterSeparator + "wm" + exportedExtension;
 if (watermark.WatermarkType.HasFlag(WatermarkType.Text))
 {
 img.AddTextWatermark(watermark.TextWaterMark);
 }
 if (watermark.WatermarkType.HasFlag(WatermarkType.Image))
 {
 var watermarkImage = Path.Combine(_hostingEnvironment.WebRootPath , originalDirectory , watermarkDirectory) + "//" + watermark.Id + exportedExtension;
 img.AddImageWatermark(watermarkImage);
 }
 img.SaveAs(temporaryImagePath);
 img.Dispose();
 }

using (var img = Image.FromFile("wwwroot/images/image.png"))
{
 // replace 'true' with the relevant condition check
 img.AddTextWatermarkIf(true, "TEXT WATERMARK") 
 .AddImageWatermarkIf(true, "wwwroot/images/logo.png", new ImageWatermarkOptions { Opacity = 30 }) 
 .SaveAs("wwwroot/images/new.png");
 img.Dispose();
}