Parameter is not valid c# winforms

private void picture_cat()

{

DataSet ds = Global_Class.select("select item_cat,item_image from item_cat");

PictureBox[] cat_pics = new PictureBox[50];

Label[] catlbl1 = new Label[50];

FlowLayoutPanel[] flow_image = new FlowLayoutPanel[50];

// cat_flow.Location = new Point(530, 75);

// cat_flow.Size = new Size(640, 180);

cat_flow.BackColor = Color.LightGray;

cat_flow.BorderStyle = BorderStyle.Fixed3D;

for (int i = 0; i < ds.Tables[0].Rows.Count; i++)

{

flow_image[i] = new FlowLayoutPanel();

flow_image[i].Name = "flw";

flow_image[i].Location = new Point(0, 0);

flow_image[i].Size = new Size(80, 80);

flow_image[i].BackColor = Color.DimGray;

flow_image[i].BorderStyle = BorderStyle.Fixed3D;

catlbl1[i] = new Label();

catlbl1[i].Size = new Size(80, 15);

catlbl1[i].Text = ds.Tables[0].Rows[i][1].ToString() + "'s";

catlbl1[i].Font = new Font("Calibra", 8, FontStyle.Bold);

catlbl1[i].ForeColor = Color.BurlyWood;

flow_image[i].Controls.Add(catlbl1[i]);

cat_pics[i] = new PictureBox();

cat_pics[i].Name = ds.Tables[0].Rows[i][1].ToString();

cat_pics[i].Size = new Size(65, 65);

string s = (string)ds.Tables[0].Rows[i][0];

byte[] data = System.Text.Encoding.ASCII.GetBytes(s);

var stream = new MemoryStream(data);

cat_pics[i].Image = Image.FromStream(stream);//This line to Parameter is not valid error throw

cat_pics[i].SizeMode = PictureBoxSizeMode.Zoom;

//cat_pics[i].BackColor = Color.DarkGray;

cat_pics[i].Click += pic_Click;

flow_image[i].Controls.Add(cat_pics[i]);

cat_flow.Controls.Add(flow_image[i]);

}

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