The error message section out of sequence: expected level 3, got level 4 indicates a hierarchy issue in your AsciiDoc files. Essentially, it's saying that a section with a level-4 header (e.g., ==== Level 4 Header) is appearing where a level-3 header (e.g., === Level 3 Header) is expected. If the hierarchical structure is not crucial for your final output, you may choose to ignore the error.