RSS Feed/News Content check inside a Form throwing an error

[ENXF NET]

Why can't I use contentcheck inside a form?

Error:
Line 89: Tag must be a valid conditional using an is attribute or content checking. (Line 89 is the last line)

My Code:
Code:

<xf:if contentcheck="true">
    <xf:form action="{{ link('account/custom-save') }}" ajax="true">
        <xf:contentcheck>
            <xf:if is = "!{$user.Profile.custom_fields.customA}">
                <input class="input" type="text" id="customA" name="customA">
            <xf:elseif is =...

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