打印图像问题

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打印图像问题：
private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
      {
         e.Graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
         printDocument1.DocumentName = "图像打印";


            Image tempi = RasterImageConverter.ChangeToImage(rasterImageViewer1.Image,ChangeToImageOptions.ForceChange);

            System.Drawing.Rectangle srect = new System.Drawing.Rectangle(0, 0, tempi.Width, tempi.Height);
            System.Drawing.Rectangle drect = e.MarginBounds;

            e.Graphics.DrawImage(tempi, drect, srect, GraphicsUnit.Pixel);
            GC.Collect();


      }

      private void 打印PToolStripButton_Click(object sender, EventArgs e)
      {

         if (listView1.SelectedItems.Count > 0)
         {

            this.printPreviewDialog1.Document = this.printDocument1;
            this.printPreviewDialog1.ShowDialog();
         }
         else
         {
            MessageBox.Show("请在文件列表栏中选择要打印的图像！");
         }

      }
出现预览打印，图像也显示了。点击打印，就会出现提示：
Your license file is missing, invalid or expired. LEADTOOLS will not function. Please contact LEAD Sales for information on obtaining a valid license.

但我一开始就已经SetLicense了，使用其他功能也没出现这种情况