Some issues on changing input types at client registration

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"SyntaxError: Unexpected token < in JSON at position 0"

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if ((utf8_strlen($this->request->post['email']) > 96) || !filter_var($this->request->post['email'], FILTER_VALIDATE_EMAIL)) {
$this->error['email'] = $this->language->get('error_email');
}

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data: $('#collapse-payment-address input[type=\'text\'], #collapse-payment-address input[type=\'email\'], #collapse-payment-address input[type=\'date\'], #collapse-payment-address input[type=\'datetime-local\'], #collapse-payment-address input[type=\'time\'], #collapse-payment-address input[type=\'password\'], #collapse-payment-address input[type=\'hidden\'], #collapse-payment-address input[type=\'checkbox\']:checked, #collapse-payment-address input[type=\'radio\']:checked, #collapse-payment-address textarea, #collapse-payment-address select'),