Title: Cannot modify header information
Last modified: July 5, 2018

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# Cannot modify header information

 *  Resolved [patwist](https://wordpress.org/support/users/patwist/)
 * (@patwist)
 * [7 years, 11 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-144/)
 * Hello, when updating Jetpack to 6.3.2 I got following messages but no problems:
 * Notice: Undefined index: tab in /data/web/virtuals/15459/virtual/www/subdom/mywebsite/
   wp-content/plugins/popcashnet-code-integration-tool/functions.php on line 45
 * Notice: Undefined variable: i in /data/web/virtuals/15459/virtual/www/subdom/
   mywebsite/wp-content/plugins/popcashnet-code-integration-tool/functions.php on
   line 45
 * Warning: Cannot modify header information – headers already sent by (output started
   at /data/web/virtuals/15459/virtual/www/subdom/mywebsite/wp-content/plugins/popcashnet-
   code-integration-tool/functions.php:45) in /data/web/virtuals/15459/virtual/www/
   subdom/mywebsite/wp-admin/includes/misc.php on line 1116
    Plugin bol úspešne 
   reaktivovaný. (translation from SK: Plugin was successfully reactivated)
 * [screenshot](http://i64.tinypic.com/14wfw2p.png)

The topic ‘Cannot modify header information’ is closed to new replies.

 * ![](https://ps.w.org/popcashnet-code-integration-tool/assets/icon-256x256.png?
   rev=2312291)
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## Tags

 * [header information](https://wordpress.org/support/topic-tag/header-information/)

 * 0 replies
 * 1 participant
 * Last activity: [7 years, 11 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-144/)
 * Status: resolved