Notice: undefined variable --->($databahan)

salah dimananya y? ko variabel $dataBahan gk kebaca??

<?php
// Validasi Login : yang boleh mengakses halaman ini hanya yang sudah Login admin
include_once "../library/inc.sesadmin.php";
include_once "../library/inc.library.php";
include_once "../library/inc.connection.php";
# TOMBOL SIMPAN DIKLIK
if(isset($_POST['btnSimpan'])){
	// Baca form
	$txtNama	= $_POST['txtNama'];
	$txtNama 	= str_replace("'","´",$txtNama);
	$txtNama	= ucwords(strtolower($txtNama));

	$cmbBahan	=$_POST['cmbBahan'];

	$txtHrgJual		= $_POST['txtHrgJual'];
	$txtHrgJual 	= str_replace("'","´",$txtHrgJual);

	$txtStok	= $_POST['txtStok'];
	$txtStok 	= str_replace("'","´",$txtStok);

	$txtKeterangan	=$_POST['txtKeterangan'];
	$txtKeterangan 	= str_replace("'","´",$txtKeterangan);

	$cmbKategori	=$_POST['cmbKategori'];

	// Validasi form
	$pesanError = array();
	if (trim($txtNama)=="") {
		$pesanError[] = "Data <b>Nama Barang</b> tidak boleh kosong !";
	}
	if (trim($txtKeterangan)=="") {
		$pesanError[] = "Data <b>Keterangan</b> tidak boleh kosong !";
	}
	if (trim($cmbKategori)=="KOSONG") {
		$pesanError[] = "Data <b>Kategori</b> belum dipilih !";
	}

	# JIKA ADA PESAN ERROR DARI VALIDASI
	if (count($pesanError)>=1 ){
		echo "<div class='mssgBox'>";
		echo "<img src='../images/attention.png'> <br><hr>";
			$noPesan=0;
			foreach ($pesanError as $indeks=>$pesan_tampil) {
			$noPesan++;
				echo "   $noPesan. $pesan_tampil<br>";
			}
		echo "</div> <br>";
	}
	else {
		# SIMPAN DATA KE DATABASE. Jika tidak menemukan pesan error, simpan data ke database
		// Membuat kode baru
		$kodeBaru	= buatKode("barang", "B");

		// Mengkopi file gambar
		if (! empty($_FILES['namaFile']['tmp_name'])) {
			$nama_file = $_FILES['namaFile']['name'];
			$nama_file = stripslashes($nama_file);
			$nama_file = str_replace("'","",$nama_file);
			$nama_file = str_replace(" ","-",$nama_file);
			$nama_file = $kodeBaru.".".$nama_file;
			copy($_FILES['namaFile']['tmp_name'],"../img-barang/".$nama_file);
		}
		else {
			$nama_file = "";
		}

		// Simpan data dari form ke database
		$mySql	= "INSERT INTO barang (kd_barang, nm_barang, kd_bahan,
		harga_jual, stok, keterangan, file_gambar, kd_kategori) VALUES('$kodeBaru', '$txtNama', '$dataBahan', '$txtHrgJual', '$txtStok', '$txtKeterangan',
		 '$nama_file', '$cmbKategori')";
		$myQry	= mysql_query($mySql, $koneksidb)  or die ("Query salah : ".mysql_error());
		if($myQry){
			// Refresh
			echo "<meta http-equiv='refresh' content='0; url=?open=Barang-Add'>";
		}
	}
}

# MEMBUAT NILAI DATA PADA FORM
# SIMPAN DATA PADA FORM, Jika saat Sumbit ada yang kosong (lupa belum diisi)
$dataKode		= buatKode("barang", "B");
$dataNama		= isset($_POST['txtNama']) ? $_POST['txtNama'] : '';
$dataBahan		= isset($_POST['cmbBahan']) ? $_POST['cmbBahan'] : '';
$dataHrgJual	= isset($_POST['txtHrgJual']) ? $_POST['txtHrgJual'] : '';
$dataStok		= isset($_POST['txtStok']) ? $_POST['txtStok'] : '';
$dataKeterangan	= isset($_POST['txtKeterangan']) ? $_POST['txtKeterangan'] : '';
$dataKategori	= isset($_POST['cmbKategori']) ? $_POST['cmbKategori'] : '';
?>
<meta content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0, shrink-to-fit=no' name='viewport' />
  <!--     Fonts and icons     -->
  <link href="https://fonts.googleapis.com/css?family=Montserrat:400,700,200" rel="stylesheet" />
  <link href="https://maxcdn.bootstrapcdn.com/font-awesome/latest/css/font-awesome.min.css" rel="stylesheet">
  <!-- CSS Files -->
  <link href="../assets/css/bootstrap.min.css" rel="stylesheet" />
  <link href="../assets/css/paper-dashboard.css?v=2.0.0" rel="stylesheet" />
  <!-- CSS Just for demo purpose, don't include it in your project -->
  <link href="../assets/demo/demo.css" rel="stylesheet" />

<form action="<?php $_SERVER['PHP_SELF']; ?>" method="post" enctype="multipart/form-data" name="frmadd">
  <table class="table-list" width="100%" style="margin-top:0px;">
	<tr>
	  <th colspan="3"><strong>TAMBAH DATA BARANG </strong></th>
	</tr>
	<tr>
	  <td width="14%"><strong>Kode</strong></td>
	  <td width="1%"><strong>:</strong></td>
	  <td width="85%"><input name="textfield" value="<?php echo $dataKode; ?>" size="10" maxlength="10" readonly="readonly"/></td></tr>
	<tr>
	  <td><strong>Nama Barang </strong></td>
	  <td><strong>:</strong></td>
	  <td><input name="txtNama" value="<?php echo $dataNama; ?>" size="80" maxlength="200" /></td>
	</tr>
	<tr>
      <td><strong>Bahan</strong></td>
	  <td><strong>:</strong></td>
	  <td><select name="cmbBahan">
        <option value="KOSONG" selected="selected">....</option>
        <?php
		$comboSql = "SELECT * FROM bahan ORDER BY nm_bahan ASC";
		$comboQry = mysql_query($comboSql, $koneksidb) or die ("Gagal query".mysql_error());
		while ($comboData =mysql_fetch_array($comboQry)) {
			if ($comboData['kd_bahan']==$dataBahan) {
				$cek="selected";
			}
			else {
				$cek="";
			}
			echo "<option value='$comboData[kd_bahan]' $cek>$comboData[nm_bahan]</option>";
		}
		?>
      </select>
	    </td>
    </tr>
	<tr>
	  <td><strong>Harga   Jual (Rp) </strong></td>
	  <td><strong>:</strong></td>
	  <td><input name="txtHrgJual" type="text" value="<?php echo $dataHrgJual; ?>" size="20" maxlength="12" /></td>
    </tr>
	<tr>
	  <td><strong>Jumlah Stok </strong></td>
	  <td><strong>:</strong></td>
	  <td><input name="txtStok" type="text" value="<?php echo $dataStok; ?>" size="10" maxlength="4" /></td>
    </tr>
	<tr>
	  <td><strong>File Gambar </strong></td>
	  <td><strong>:</strong></td>
	  <td><input name="namaFile" type="file" size="70" /></td>
	</tr>
	<tr>
	  <td><strong>Keterangan</strong></td>
	  <td><strong>:</strong></td>
	  <td><textarea id="elm1" name="txtKeterangan" cols="70" rows="6"><?php echo $dataKeterangan; ?></textarea></td>
    </tr>
	<tr>
	  <td><strong>Kategori</strong></td>
	  <td><strong>:</strong></td>
	  <td><select name="cmbKategori">
        <option value="KOSONG">....</option>
        <?php
		  $mySql = "SELECT * FROM kategori ORDER BY nm_kategori";
		  $myQry = mysql_query($mySql, $koneksidb) or die ("Gagal Query".mysql_error());
		  while ($myData = mysql_fetch_array($myQry)) {
			if ($myData['kd_kategori']== $dataKategori) {
				$cek = " selected";
			} else { $cek=""; }
			echo "<option value='$myData[kd_kategori]' $cek> $myData[nm_kategori] </option>";
		  }
		  ?>
      </select></td>
    </tr>
	<tr><td> </td>
	  <td> </td>
	  <td><input type="submit" name="btnSimpan" value=" SIMPAN DATA " style="cursor:pointer;"></td>
    </tr>
</table>
</form>