验证 html 代码，错误表第 2 列建立的元素 th 没有单元格开头

Question

My code seams to work fine but trying to validate it at https://validator.w3.org/nu/#file it gives me error: Table column 2 established by element th has no cells beginning in it. If I remove the rowspan attribute I get no errors. How could this be?

        <table>
            <caption>Average salary</caption>
            <tr>
                <th colspan="2" rowspan="2">Occupation</th>
                <th colspan="2">Salary (kr)</th>
            </tr>
            <tr>

                <th>Men</th>
                <th>Women</th>
            </tr>
            <tr>
                <td colspan="2">Ambulance nurse</td>
                <td>37 400</td>
                <td>36 800</td>

            </tr>
            <tr>
                <td colspan="2">Consultant system development</td>
                <td>43 000</td>
                <td>43 500</td>

            </tr>
            <tr>
                <td colspan="2">High school teacher</td>
                <td>35 000</td>
                <td>35 400</td>

            </tr>
            <tr>
                <td colspan="2">Dentist</td>
                <td>44 400</td>
                <td>46 100</td>

            </tr>
            <tr>
                <td colspan="2">Air lane leader</td>
                <td>65 700</td>
                <td>66 500</td>

            </tr>
            <tr>
                <td colspan="2">Bar manager</td>
                <td>23 000</td>
                <td>23 000</td>

            </tr>
            <tr>
                <td colspan="2">Home service assistant</td>
                <td>27 100</td>
                <td>27 400</td>

            </tr>

        </table>

What I want to achieve is this structure

Answer 1

The solution was this code:

        <table>
            <caption>Average salary</caption>
            <tr>

                <th rowspan="2">Occupation</th>
                <th colspan="2">Salary (kr)</th>
            </tr>
            <tr>
                <th>Men</th>
                <th>Women</th>
            </tr>
            <tr>
                <td>Ambulance nurse</td>
                <td>37 400</td>
                <td>36 800</td>

            </tr>
            <tr>
                <td>Consultant system development</td>
                <td>43 000</td>
                <td>43 500</td>

            </tr>
            <tr>
                <td>High school teacher</td>
                <td>35 000</td>
                <td>35 400</td>

            </tr>
            <tr>
                <td>Dentist</td>
                <td>44 400</td>
                <td>46 100</td>

            </tr>
            <tr>
                <td>Air lane leader</td>
                <td>65 700</td>
                <td>66 500</td>

            </tr>
            <tr>
                <td>Bar manager</td>
                <td>23 000</td>
                <td>23 000</td>

            </tr>
            <tr>
                <td>Home service assistant</td>
                <td>27 100</td>
                <td>27 400</td>

            </tr>

        </table>