[SalesForce] Ampscript for Footer Content

I have about four footer variations that we use at the bottom of our email templates. I've been trying to place the various footers in:

MyContents\Company_Footers\FooterNameHere

An example footer might look like this:

<!-- BEGIN FOOTER -->
<table align="center" bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="0" width="600" class="responsive-table">
    <tr>
        <td style="font-family:Arial, Sans-serif; font-size:10px; color:#3d4651; line-height:18px; text-align: center; padding: 10px;">
            Copyright &copy; 2017 %%Member_Busname%%<br>
            %%Member_Addr%% %%Member_City%%, %%Member_State%%, %%Member_PostalCode%% <br>
            International: 407.000.0000 USA &amp; Canada: 866.000.0000
            <br><br>
            Past results are not necessarily indicative of future results.<br>
            <a href="http://risk-disclaimer-link" style="font-size: 10px; color: #288dc1;">RISK DISCLAIMER</a> | <a href="http://general-disclaimer-link" style="font-size: 10px; color: #288dc1;">GENERAL DISCLAIMER</a> | <a href="%%unsub_center_url%%" style="font-size: 10px; color: #288dc1;" target="_blank">UNSUBSCRIBE</a>
        </td>
    </tr>
</table>
<!-- END FOOTER -->

Within my HTML, I am trying to pull that footer in via Ampscript like this:
%%=ContentAreaByName("my contents\EM_Footers\GenFooter")=%%

I recall doing it this way with a previous employer but something is missing because SFMC keeps giving me the following error message when I do a Send Preview against a data extension:

Unable to generate preview
The email is missing a valid physical mailing address, which must be present on commercial emails per the federal CAN-SPAM Act. Please add a valid postal address in your account settings, or modify your email to include these fields, then you may resend your email.

• For HTML Paste emails, please select 'Physical Mailing Address' under 'Email Tools' to insert the physical mailing address in HTML version of the email.

• The recommended format for the physical mailing address in the TEXT version of your email is the following:
  This email was sent by:
  %%Member_Busname%%
  %%Member_Addr%%
  %%Member_City%%, %%Member_State%%, %%Member_PostalCode%%, %%Member_Country%%

• For Template based emails, your footer should already have the physical mailing address.

What do I need to do to avoid this error? I know I've been able to get it to work before but I'm missing a step somewhere.