'syntax error: missing operand after 'nama' operator.'

Kira kira kenapa ya ini error 'Syntax error: Missing operand after 'nama' operator.'

Code :

con.Open();
            SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM tb_kpu",con);
            DataTable dt = new DataTable();

            DataView dv = new DataView(dt);
            dv.RowFilter ="WHERE nama LIKE '%" + textBox1.Text + "%' ";
            dataGridView1.DataSource = dv;
            con.Close();