Hello, I just uploaded my themantic child theme and am getting a weird error message every time i try to install a plugin

I just uploaded my themantic child theme and am getting a weird error message every time i try to install a plugin

Warning: Cannot modify header information - headers already sent by (output started at /home/content/29/7464729/html/wp-content/themes/coolness/functions.php:126) in /home/content/29/7464729/html/wp-includes/p开发者_StackOverflow中文版luggable.php on line 934

Does anybody know what i should do about this?

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Check your code with following guide:-

• Remove blank line before the opening php statement
• Remove blank lines after the closing php statement
• Remove irrelevant echo's in your code

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