Hi, I received an error when trying to add an image to my post: Fatal error: Call to undefined function get_post_thumbnail_id()
I googled the error and found what was supposed to be a fix. Add this code to my theme’s functions file: Fatal error: Call to undefined function get_post_thumbnail_id()
When I added it the site was down entirely. I removed and now half the site is down. The functions file was empty when I added the line of code.
Not sure what to do now? this is my site http://www.musiciansmash.com
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