Functions missing in WordPress 3.6

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asked Aug 12, 2013 in Website Builder by DinoGuy (2,130 points)
Hi all
I was using WordPress 3.5.2 and I tried upgrading today to 3.6. However I got some warning errors about certain functions being invalid
“ call_user_func_array() expects parameter 1 to be a valid callback”
“ function '_show_post_preview' not found or invalid “

Does  anyone know how to solve these errors?  Please help
thanks

2 Answers

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answered Aug 12, 2013 by WebProX (12,200 points)
Try to switch to your default theme. Rename your theme's folder located in the  wp-content/themes. This can be done using FTP .
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answered Aug 12, 2013 by expert (14,380 points)
Re upload all the files and folders from a fresh start (except for the folder wp-content). Don’t forget to override all the existing files
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