XML sitemap errors and how to fix them
TL;DR: Sitemap errors reported in Search Console fall into a handful of specific, mechanical categories, each with a direct fix: URLs listed in the sitemap that are simultaneously blocked by robots.txt (a direct contradiction), non-canonical URL variants included alongside or instead of the canonical version, malformed XML syntax preventing the sitemap from being parsed at all, and URLs in the sitemap that return errors or redirects rather than resolving directly. None of these require guesswork, Search Console's sitemap report identifies the specific issue type directly.
Why sitemap errors matter beyond just fixing a report warning
A sitemap's core function is to give search engines a direct, efficient list of the URLs you consider worth crawling and indexing, and errors within it undermine that function in specific ways: contradictory signals (a blocked-but-listed URL) waste crawl attention and create confusion about your actual intent, non-canonical inclusions dilute the clarity of which version of a page should be indexed, and malformed XML can, in the worst case, cause the entire sitemap to be unreadable, meaning none of the URLs within it are being efficiently communicated to search engines at all, not just the specific problematic entries.
Fixing sitemap errors is therefore not just about clearing a Search Console warning cosmetically; it directly affects how efficiently and accurately search engines can discover and prioritize your actual content.
Error 1: URLs blocked by robots.txt
This occurs when a URL is included in your sitemap (signaling "please crawl and consider this") while simultaneously being disallowed in your robots.txt file (signaling "do not crawl this"), a direct contradiction that search engines generally resolve by respecting the robots.txt block, meaning the sitemap inclusion is simply wasted and potentially confusing. This commonly happens when a broad robots.txt rule (blocking an entire directory or URL pattern for legitimate reasons) inadvertently also catches URLs your sitemap generator is including without awareness of that specific robots.txt rule, since the two are typically generated or maintained somewhat independently (robots.txt often maintained manually or by a security-focused consideration, while the sitemap is often auto-generated by an SEO plugin based on published content).
The fix is aligning the two: either removing the specific URLs from your sitemap if the robots.txt block is intentional and correct, or adjusting the robots.txt rule if the block was actually overly broad and unintentionally caught URLs that should genuinely be crawlable.
Error 2: non-canonical URLs included
If your sitemap includes URL variants that are not your intended canonical version, duplicate content accessible via multiple paths, URLs with tracking parameters, or a non-preferred www/non-www or HTTP/HTTPS variant, this creates ambiguity about which specific URL you actually want indexed, working against the clarity a properly implemented canonical tag (covered in our Search Console indexing guide) is meant to establish.
The fix is ensuring your sitemap generation only includes canonical URLs, which most modern SEO plugins handle automatically and correctly by default, but is worth explicitly verifying, particularly on a site with a history of URL structure changes, parameter-based filtering or sorting, or multiple accessible variants of the same underlying content.
Error 3: malformed XML / sitemap can't be read
A sitemap must conform to specific XML formatting standards, and any deviation, an unescaped special character, an incorrectly nested tag, invalid encoding, can cause the entire file to fail parsing, meaning search engines cannot read any part of it, not just the specific malformed entry. This is a more severe error than the previous two, since it can effectively nullify your entire sitemap's usefulness rather than affecting only specific problematic URLs.
This most commonly happens with manually edited or custom-generated sitemaps rather than ones produced automatically by a well-maintained SEO plugin, since automatic generation tools generally handle proper XML formatting and character escaping correctly by design. If you are using a reputable, current SEO plugin for sitemap generation and encounter this error, it may indicate a plugin bug (worth checking for an available update) or a conflict with another plugin also attempting to modify sitemap output; if you have a manually created or custom-coded sitemap, validating it against the XML sitemap protocol's formal specification (several online sitemap validator tools exist for exactly this purpose) identifies the specific formatting issue directly.
Error 4: URLs returning errors or redirects
Including URLs in your sitemap that actually return a 404, a 500 error, or redirect elsewhere rather than resolving directly wastes crawl budget on URLs that provide no indexable content at their listed location, and signals a degree of sitemap maintenance neglect that can subtly affect how much trust search engines place in the sitemap's overall accuracy.
This commonly accumulates over time on sites where content has been deleted, moved, or restructured (with proper redirects in place for user experience, appropriately, but the sitemap not correspondingly updated to reflect the new URL rather than the old, now-redirecting one) without the sitemap being regenerated or manually corrected to match. The fix is regenerating your sitemap (most SEO plugins do this automatically on a rolling basis, though it is worth confirming this is genuinely happening rather than assuming) and specifically auditing for and removing any URLs no longer resolving directly and successfully.
Error 5: sitemap not found / wrong location
Occasionally the reported issue is simpler still: Search Console cannot locate the sitemap at the URL you submitted at all, either because the sitemap was moved, deleted, or was never actually generated correctly in the first place, or because the submitted URL in Search Console itself contains a typo or references an outdated location from a previous site configuration. Confirming the sitemap is genuinely accessible by loading its exact URL directly in a browser, and correcting the submitted URL in Search Console if it does not match, resolves this directly.
A fix-priority table
| Error type | Severity | Fix |
|---|---|---|
| Malformed XML | High (can nullify entire sitemap) | Validate XML, check plugin conflicts/updates |
| Sitemap not found | High (nothing being communicated at all) | Confirm actual sitemap URL, correct Search Console submission |
| URLs blocked by robots.txt | Moderate | Align sitemap and robots.txt intent |
| Non-canonical URLs included | Moderate | Ensure sitemap generation uses canonical URLs only |
| Error-returning/redirecting URLs | Lower, but accumulates | Regenerate sitemap, remove stale entries |
Preventing recurring errors
A few practices reduce how often these errors recur rather than needing repeated manual fixing. Use a well-maintained, reputable SEO plugin for automatic sitemap generation rather than a manually maintained or custom-coded sitemap, since automatic generation correctly handles canonical URL selection, proper XML formatting, and (in well-designed plugins) automatic exclusion of noindexed or otherwise inappropriate URLs by default. Periodically cross-check your sitemap against your robots.txt file, particularly after any changes to either, to catch new contradictions before they accumulate. And check the Search Console sitemap report on a regular cadence (monthly is reasonable for most sites) rather than only when you happen to notice an indexing problem, since catching a malformed sitemap or a wrong-location submission promptly limits how long your site goes without the sitemap's discovery benefit functioning correctly.
FAQs
Do I need to manually create my sitemap, or should a plugin handle it?
For the large majority of WordPress sites, a well-maintained SEO plugin's automatic sitemap generation is the more reliable, lower-maintenance option, correctly handling canonical selection, XML formatting, and automatic updates as content changes, compared to a manually created and maintained sitemap, which requires ongoing manual diligence to stay accurate and error-free.
How quickly does Search Console detect a fixed sitemap error?
This varies, but re-submitting the sitemap through Search Console after making a fix (rather than waiting for the next automatic recrawl) typically prompts a re-check within a reasonably short period, often within a day or so, though full resolution of any downstream effects (like re-indexing previously affected pages) can take longer.
Should every single URL on my site be in the sitemap?
No, generally only genuinely indexable, canonical URLs you want search engines to discover and index should be included; deliberately noindexed pages, non-canonical duplicates, and purely functional/utility URLs should typically be excluded, which most well-configured SEO plugins handle automatically by only including published, indexable content by default.
Can having sitemap errors actually hurt my rankings, or is it just a report warning?
Directly, a malformed or inaccessible sitemap reduces the efficiency of content discovery, which can delay indexing of new or updated content, an indirect but real effect on visibility; the moderate-severity errors (robots.txt conflicts, non-canonical inclusion) are less likely to cause direct ranking harm but do represent wasted opportunity and potential confusion in how search engines interpret your site's structure.
How many sitemaps can or should a site have?
Large sites commonly use a sitemap index file referencing multiple individual sitemaps (split by content type or to stay within the URL-per-sitemap limits search engines specify), while a smaller site typically needs only a single sitemap file; most SEO plugins handle this splitting automatically as your site grows, without requiring manual sitemap architecture decisions on your part.
Does WooCommerce need a different sitemap approach than a regular WordPress site?
The same general principles apply, though a store with many product variations, filtered/sorted URL parameters, and potentially out-of-stock or discontinued products needs particular attention to ensuring only canonical, genuinely available product URLs are included, since ecommerce sites are especially prone to accumulating non-canonical URL variants that a generic sitemap configuration might inadvertently include.
Is it bad to submit multiple sitemap URLs to Search Console if I've changed my SEO plugin over time?
Yes, worth cleaning up; submitting an outdated sitemap URL from a previous plugin or configuration alongside your current, correct one can create confusion and potentially resurface old, no-longer-accurate error reports, so removing outdated sitemap submissions and confirming only your current, correct sitemap URL is actively submitted is good housekeeping.
Conclusion
XML sitemap errors fall into a small number of specific, mechanical categories, each directly identified by Search Console's own reporting and each with a clear, specific fix, robots.txt contradictions, non-canonical inclusions, malformed XML, and stale error-returning URLs. Using a well-maintained SEO plugin for automatic sitemap generation prevents most of these from occurring in the first place, since manual sitemap maintenance is where these errors most commonly accumulate.
Check the Search Console sitemap report on a regular cadence rather than only reactively, since catching a sitemap-nullifying issue like malformed XML promptly limits how long your site's content discovery efficiency is affected.
HostCloud's free sitemap validator checks your sitemap against all five common error categories directly, helping you catch and fix issues before they meaningfully affect indexing. Try it at https://hostcloud.in/tools.