Hi I am using SS 2.4.2 and the latest release of the newsletter module (0.4.0rc).

Now when I go to the /newsletter/ subscriptionpage and enter a email adress that is already registered Iam getting a user error:

[User Error] Uncaught ValidationException:
POST /newsletter/Form

Line 627 in XXXXXXXXXXXXX/sapphire/security/Member.php
Source

618 				'Member', 
619 				sprintf(
620 					"\"%s\" = '%s' %s",
621 					$identifierField,
622 					Convert::raw2sql($this->$identifierField),
623 					$idClause
624 				)
625 			);
626 			if($existingRecord) {
627 				throw new ValidationException(new ValidationResult(false, sprintf(
628 					_t(
629 						'Member.ValidationIdentifierFailed', 
630 						'Can\'t overwrite existing member #%d with identical identifier (%s = %s))', 
631 						PR_MEDIUM,
632 						'The values in brackets show a fieldname mapped to a value, usually denoting an existing email address'
633 					),

Trace

    * Member->onBeforeWrite()
      Line 936 of DataObject.php
    * DataObject->write()
      Line 234 of SubscriptionPage.php
    * SubscriptionPage_Controller->doSubscribe(Array,Form,SS_HTTPRequest)
      Line 300 of Form.php
    * Form->httpSubmission(SS_HTTPRequest)
      Line 137 of RequestHandler.php
    * RequestHandler->handleRequest(SS_HTTPRequest)
      Line 155 of RequestHandler.php
    * RequestHandler->handleRequest(SS_HTTPRequest)
      Line 147 of Controller.php
    * Controller->handleRequest(SS_HTTPRequest)
      Line 199 of ContentController.php
    * ContentController->handleRequest(SS_HTTPRequest)
      Line 67 of ModelAsController.php
    * ModelAsController->handleRequest(SS_HTTPRequest)
      Line 281 of Director.php
    * Director::handleRequest(SS_HTTPRequest,Session)
      Line 124 of Director.php
    * Director::direct(/newsletter/Form)
      Line 127 of main.php

After searching about this issue Ive found this topic http://www.silverstripe.org/all-other-modules/show/292191?start=0
and tried to unsubscribe by goin to /unsubscribe/index/email@adress.com but now I run into the same problem mentioned in the other topic.

Is there any fix for this problem or is there another newsletter module that I could use instead?
Maybe I just forgot to install another module that is needed by the newsletter module but I was searching for a while now and didnt find an "up-to-date" documantation or other useful stuff.