I have installed the wp-nivo-slider and am now getting a list of these errors on my /wp-admin/ page.

The error is:

Warning: Cannot modify header information - headers already sent by (output started at /html/wp-content/plugins/wp-nivo-slider/wp-nivo-slider.php:633) in /html/wp-login.php on line 354

Any ideas?

1 Answer 1


This error is typically from there being extra spaces after the final closing ?> tag in a plugin file, or possibly even your wp-config.php file.

  • That is it. For some reason the wp-nivo-slider.php was too spaced out (extra line breaks). Probably a file encoding thing. Thank you!
    – GavinR
    Apr 15, 2011 at 2:19

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