Errormassages after submit-button

[webmaster stormis]

Hello forum,

I am using newsletter 4.2.2 in my blog. Now there is a problem: If a new subsciber presses the submit-button for confirmation, an errormessage with three lines appears:

Warning: Cannot modify header information – header already sent by (output started at /homepage/29/d33380275/htdocs/index.php:1) in /homepages/29/d33380275/htdocs/wp/wp-content/plugins/newsletter/includes/module.php on line 697
Warning: Cannot modify header information – header already sent by (output started at /homepage/29/d33380275/htdocs/index.php:1) in /homepages/29/d33380275/htdocs/wp/wp-content/plugins/newsletter/includes/module.php on line 698
Warning: Cannot modify header information – header already sent by (output started at /homepage/29/d33380275/htdocs/index.php:1) in /homepages/29/d33380275/htdocs/wp/wp-content/plugins/newsletter/includes/module.php on line 699

Circa 3 seconds later a new screen appears:

Warning: Cannot modify header information – header already sent by (output started at /homepage/29/d33380275/htdocs/index.php:1) in /homepages/29/d33380275/htdocs/wp/wp-content/plugins/newsletter/includes/module.php on line 820

There after the screen stops. The subscriber gets an e-mail with a link to confirm his account. If he clicks the link he gets the messages

Warning: Cannot modify header information – header already sent by (output started at /homepage/29/d33380275/htdocs/index.php:1) in /homepages/29/d33380275/htdocs/wp/wp-content/plugins/subscription/ subscription.php on line 617
Warning: Cannot modify header information – header already sent by (output started at /homepage/29/d33380275/htdocs/index.php:1) in /homepages/29/d33380275/htdocs/wp/wp-content/plugins/subscription/ subscription.php on line 116
Warning: Cannot modify header information – header already sent by (output started at /homepage/29/d33380275/htdocs/index.php:1) in /homepages/29/d33380275/htdocs/wp/wp-content/plugins/subscription/ subscription.php on line 820

There after the screen stops and the subscriber gets a second e-mail with the confirmation of his account.

How can I solve this problem? Because the admin does not receive any information about the new subscriber.

Thanking you in anticipation
Sven

[Stefano]

It seems there are PHP notices from the plugin. Can you try disabling the wp_debug on wp-config.php?

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