I have trouble seeing only what I could "better" explain, you have the number of the line on the left
the type of error to be corrected
without your changelog will not show up in-game, and therefore be useless.
for the version it must be for example 0.0.1 or 2020.11.23
nothing else is accepted.
and the date format are year.month.day or year-month-day
for "Fields can't be empty" it's usually a [category:] but nothing behind it.
like a date without "date" value (you can just delet "Date:" too
the errors were found with to this tool
https://mods.factorio.com/mod/da-changelog-tools