Title: Errors on post-template.php lines 721 & 516
Last modified: August 30, 2016

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# Errors on post-template.php lines 721 & 516

 *  [nostrebor](https://wordpress.org/support/users/nostrebor/)
 * (@nostrebor)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/errors-on-post-templatephp-lines-721-516/)
 * I receive these 2 errors and do not know how to fix them. I need some help please.
   I am running: WordPress 4.2.2 running BLDR theme.
 * > Warning: array_unique() [function.array-unique]: The argument should be an 
   > array in /home/content/n/o/s/myusername/html/wp-includes/post-template.php 
   > on line 721
   > Warning: join() [function.join]: Invalid arguments passed in /home/content/
   > n/o/s/myusername/html/wp-includes/post-template.php on line 516
   >  class=””>
 * This is where I first saw the error: [http://homeschoolingonashoestring.com/list-of-search-engines/www.crosssearch.com](http://homeschoolingonashoestring.com/list-of-search-engines/www.crosssearch.com)
   
   I realized the link itself is an error, but it brought up the 2 errors above.
   I tried it again using another page name that I know I do not have and it brings
   up the same error. So while it says the error is in post-template.php, I think
   the post is coming up for any 404 error. I cannot find post-template.php in the
   editor. I would appreciate some help with this please. I really like this theme
   and would love it to work as the designer/author intended. Thanks in advance!
   Jodi

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 * Last reply from: [nostrebor](https://wordpress.org/support/users/nostrebor/)
 * Last activity: [10 years, 10 months ago](https://wordpress.org/support/topic/errors-on-post-templatephp-lines-721-516/)
 * Status: not resolved