bagaimana cara mengatasi error pada tabel

mau tanya bagaimana cara menghilangkan error pada tabel ya? berikut screenshot dan codingannya :

error.png

<?php if ($_GET[act]==''){ ?>
            <div class="col-xs-12">
              <div class="box">
                <div class="box-header">
                  <h3 class="box-title">Catatan Cashflow</h3>
                  <?php if($_SESSION[level]!='kepala'){ ?>
                  <a class='pull-right btn btn-primary btn-sm' href='index.php?view=cashflow&act=tambah'>Tambahkan Data</a>
                  <?php } ?>
                </div><!-- /.box-header -->
                <div class="box-body">
                  <table id="example1" class="table table-bordered table-striped">
                    <thead>
                      <tr>
                        <th style='width:40px'>No</th>
                        <th>Kode Anggaran</th>
                        <th>Keterangan</th>
                        <th>No Bukti</th>
                        <th>Tanggal</th>
                        <th>Penerimaan</th>
                        <th>Pengeluaran</th>
                        <th>Saldo</th>
                        <?php if($_SESSION[level]!='kepala'){ ?>
                        <th style='width:70px'>Action</th>
                        <?php } ?>
                      </tr>
                    </thead>
                    <tbody>
                  <?php
                    $tampil = mysql_query("SELECT * FROM rb_cashflow ORDER BY kode_ma DESC");
                    $no = 1;
                    $saldo=0;
                    $total=0;
                    while($r=mysql_fetch_array($tampil)){
                    $saldo = $saldo + $r[debit];
                    $saldo = $saldo - $r[credit];
                    $debit = $debit + $r[debit];
                    $credit = $credit + $r[credit];
                    echo "<tr><td>$no</td>
                              <td>$r[kode_ma]</td>
                              <td>$r[keterangan]</td>
                              <td>$r[no_bkt]</td>
                              <td>$r[tgl]</td>
                              <td>Rp. ".number_format($r[debit])."</td>
                              <td>Rp. ".number_format($r[credit])."</td>
                              <td>Rp. ".number_format($saldo)."</td>";
                              if($_SESSION[level]!='kepala'){
                        echo "<td><center>
                                <a class='btn btn-success btn-xs' title='Edit Data' href='index.php?view=cashflow&act=edit&id=$r[kode_ma]'><span class='glyphicon glyphicon-edit'></span></a>
                                <a class='btn btn-danger btn-xs' title='Delete Data' href='index.php?view=cashflow&hapus=$r[kode_ma]'><span class='glyphicon glyphicon-remove'></span></a>
                              </center></td>";
                              }
                              echo "</tr>";
                      $no++;
                      }
                      echo "<tr>
                      <td colspan='5' style='text-align:right;'>Total</td>
                      <td>Rp. ".number_format($debit)."</td>
                      <td>Rp. ".number_format($credit)."</td>
                      <td colspan='2'></td>";
                      echo "</tr>";
                      if (isset($_GET[hapus])){
                          mysql_query("DELETE FROM rb_cashflow where kode_ma='$_GET[hapus]'");
                          echo "<script>document.location='index.php?view=cashflow';</script>";
                      }
                  ?>
                    </tbody>
                  </table>
                </div><!-- /.box-body -->
              </div><!-- /.box -->
            </div>

mungkin ada yang bisa bantu..