Post Content Not Showing On Single Post

Help me!!! I edited my page.php, index.php, single.php files and put the whole “header” area into header.php and made it easier and neater for the code.

However, the single.php file has only one bug in it. The post content is not showing! Everything else will show (comments template, post meta data, title, header, sidebar, footer etc) except the post content! Here is a copy of my code:

https://wordpress.pastebin.com/f400b9c7a

Can anyone tell me where I’ve gone wrong?

All the best!
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