Which issue type reported by the Site Audit tool is most severe?

Errors are the most severe issue type reported by Semrush Site Audit because they directly impact a website's search engine visibility and user experience. These issues, such as broken internal links, duplicate content, or crawlability problems, can prevent search engines from indexing pages correctly or lead to a poor user experience, ultimately harming rankings and traffic. Warnings indicate potential problems that could become more serious if not addressed but don't have an immediate critical impact. Tips offer suggestions for improvement that are not critical issues but can optimize performance. Notices are informational and typically don't require immediate action.