"Wrong email" error

Hi,

When integrating my website with Newsletter plugin I'm getting this error on the white page "Wrong email"

I've tried many things, nothing seems to work so far..

My website is: https://businessandpoker.com/principles/

<div class="tnp tnp-subscription">
<form method="post" action="https://businessandpoker.com/?na=s" onsubmit="return newsletter_check(this)">

<div class="tnp-field tnp-field-email"><label>Email</label><input class="tnp-email" type="email" name="ne" required></div>
<div class="tnp-field tnp-field-button"><input class="tnp-submit" type="submit" value="Subscribe">
</div>
</form>
</div>

I look forward to hearing from you,
All the best,
Mikk