If sitemaps are automatically generated by the CMS or plugin, then there’s no need to worry about errors as that system should handle them.
However, if sitemaps are manually generated, then some common issues that could occur are as follows:
Incorrect pages found in a sitemap
Sitemap has formatting errors
Sitemap files are too large (more than 50 MB or more than 50,000 URLs)
It’s important to make sure to review sitemap best practices are followed to prevent any sitemap errors from occurring.