211: Missing whitespace after alignment mark

You started a line with an alignment mark such as .:. or :: which was not followed by whitespace. But that is expected.


Make sure to have whitespace after an alignment mark. A single space is enough:

.:. And our journey to the center of the earth continued.

If you did not mean to set the alignment, but want to use these characters at the start of a paragraph literally, you can prepend a backslash: \.:.