Headers already sent

Warning: Cannot modify header information - headers already sent by (output started at /home/xxx/www.yoursite.com/htdocs/xxx/xxx.php:1) in /home/xxx/www.sito.it/htdocs/xxx/xxx.php on line 8
That's a common error people get. There are a lot of possible reasons for why this might happen.

Reasons

This error is due to the use of header() function: it is important to notice that header() must be called before any actual output is sent.
So you can not enter, for example, a 'echo' or 'print', even spaces and empty rows are avoid.
Solutions
Help Topics: Support | Last updated 23 Apr 2014

OpenCart Common Errors
other FAQs

  1. 500 Internal Server Error or Blank White Page
  2. Allowed Memory Size Exhausted
  3. Headers already sent
  4. Notice: Undefined index
  5. Notice: Undefined index: count in
  6. Solving vQmod Error 500
  7. vQmod does not work after updating an OpenCart installation
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