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When I try to submit the standard Contact Form 7 contact form, everything works just fine, but when I try to submit the following more complex form, I get this error.

Failed to send your message. Please try later or contact the administrator by another method.

Form Code

<p>
    Family Name: [text* family 20/] Phone # [text* home 10/]
</p>
<p>
    Address: [text* address 20/] City: [text* city 15/] Zip: [text* zip 6/]
</p>
<p>
    Father’s Name: [text* fname 10/] Email: [text* femail 10/]
</p>
<p>
    Cell Phone #: [text* fcell 10/] Work Phone: [text* fwork 10/]
</p>
<p>
    Mother’s Name [text* mname 10/] Email: [text* memail 10/]
</p>
<p>
    Cell Phone #: [text* mcell 10/] Work Phone: [text* mwork 10/]
</p>
<p>
    Marital Status: [radio maritalstatus "Married" "Divorced" "Separated" "Widowed"]
</p>
<p>
    Emergency Contact 1: [text* ename1 10/] Phone #: [text* enum1 10/]
</p>
<p>
    Emergency Contact 2: [text* ename2 10/] Phone #: [text* enum2 10/]</p>
<p>
    Family Doctor: [text* doct 10/] Phone #: [text* doctnum 10/]
</p>
<table>
    <tbody>
        <tr>
            <td align="center">

                    <strong><u>Name</u></strong>

            </td>
<td>
<td/>
            <td align="center">

                    <strong><u>DOB</u></strong></br>(mm/dd/yy)

            </td>
<td>
<td/>
            <td align="center">

                    <strong><u>School</u></strong>

            </td>
<td>
<td/>
            <td align="center">

                    <strong><u>Next Grade</u></strong>

            </td>
<td>
<td/>
            <td align="center">

                    <strong><u>T-shirt Size</u></strong></br> (xs,sml, med,lg)

            </td>
        </tr>
        <tr>
            <td>

                    1. [text c1name 10/]

            </td>
<td>
<td/>
            <td align="center"> [text* c1dob 6/]
            </td>
<td>
<td/>
            <td align="center">[text* c1school 8/]
            </td>
<td>
<td/>
            <td align="center">[text* c1grade 2/]
            </td>
<td>
<td/>
            <td align="center">[text* c1shirt 2/]
            </td>
        </tr>
        <tr>
            <td>

                    2. [text c2name 10/]

            </td>
<td>
<td/>
            <td align="center">[text c2dob 6/]
            </td>
<td>
<td/>
            <td align="center">[text c2school 8/]
            </td>
<td>
<td/>
            <td align="center">[text c2grade 2/]
            </td>
<td>
<td/>
            <td align="center">[text c2shirt 2/]
            </td>
        </tr>
        <tr>
            <td align="center">

                    3. [text c3name 10/]

            </td>
<td>
<td/>
            <td align="center">[text c3dob 6/]
            </td>
<td>
<td/>
            <td align="center">[text c3school 8/]
            </td>
<td>
<td/>
            <td align="center">[text c3grade  2/]
            </td>
<td>
<td/>
            <td align="center">[text c3shirt text 2/]
            </td>
        </tr>
    </tbody>
</table>
<p align="center">
    <strong><u>Additional Information:</u> </br> [textarea add placeholder "Allergies, Special Conditions, Concerns etc."]</p>

<p>[acceptance accept] "I, the parent/guardian of the above child/children, have read the above rules and the attached forms and agree to abide by them."  <br/>
Signed: [text* signee]
Date: [date* date-accept]
</p>
<p>[submit "Send"]</p>

Output Message:

From: [family] < [memail] >
Subject: Summer 5775 Camp Application

Family Name: [family] Phone #: [home]
Address: [address], City: [city], NY [zip]

Father’s Name: [fname] Email: [femail]
Cell Phone #: [fcell] Work Phone: [fwork]

Mother’s Name [mname] Email: [memail]
Cell Phone #: [mcell] Work Phone: [mwork]

Marital Status: [maritalstatus]

Emergency Contact 1: [ename1] Phone #: [enum1]
Emergency Contact 2: [ename2] Phone #: [enum2]
Family Doctor: [doct] Phone #: [doctnum]

<b>Name, DOB, School, Next Grade, T-shirt Size<b>
1. [c1name], [c1dob], [c1school], [c1grade], [c1shirt]
2. [c2name], [c2dob], [c2school], [c2grade], [c2shirt]
3. [c3name], [c3dob], [c3school], [c3grade], [c3shirt]

[add]

[accept]
"I, the parent/guardian of the above child/children, have read the above rules and the attached forms and agree to abide by them."
Signed [signee], Date: [date-accept]
--
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Any ideas?

https://www.ads-software.com/plugins/contact-form-7/