176: Heading text missing
The characters ===
, ---
or - -
at the start and end of a block mark the block as heading. In your case the heading lacks content.
Solution
Make sure your heading includes content, if you want to use a heading.
The characters ---
or - -
can also be used to mark a section or subsection break respectively. In this case, make sure ---
or - -
are the only three characters in the block.
=== I'm a main heading ===
--- I'm a section heading ---
Below is a subsection break:
- -
If you did not mean to create a heading or section break, but want to use these characters literally at the start of a paragraph, you can prepend a backslash: \---