Membership Plugin Subscribe Does Not Work

@Barry

I am summarising my issue here:

I cannot subscribe a member and get an error as per the image

Here's my theme top 4 lines
`<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>

<head profile="http://gmpg.org/xfn/11">
<meta http-equiv="Content-Type" content="<?php bloginfo('html_type':wink:; ?>; charset=<?php bloginfo('charset':wink:; ?>" />"

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