<center>
<img src="Image URL Here"></a>
</center>
You're using
</a>, which means you're attempting to close a reference tag without having one open. Likewise you failed to provide an alternative textual value or self-close the image element.
Try not to use deprecated element tags. Since the web is evolving, it is always best to use semantic templating.
Use something such as;
<div style="text-align: center;"><a href="x" target="_blank"><img src="y" alt="*" /></a></div>
Replace "x" with a direct URL that you want to link users to upon clicking the image. Replace "y" with the direct path to the image.
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