sitemap error due to conflict with buddypress

If you are receiving an error of ‘XML Parsing Error: XML or text declaration not at start of entity’ or ‘XML declaration allowed only at the start of the document’ this is typically caused by another plugin or theme inserting a small amount of whitespace before the first line of the sitemap file, which is what then triggers the error.
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The error ‘XML declaration allowed only at the start of the document’ is most often caused when another plugin or theme adds white space to the beginning of the sitemap file. You will need to view the source code of the sitemap_index.xml document in order to confirm this and we have additional information on this and how to resolve this error at the following link: https://kb.yoast.com/kb/xml-sitemap-error/

However, this issue can also be caused by an empty line at the end of your theme’s functions.php file. If there is no empty line in this file, we highly recommend running a conflict check to identify what outputs the empty white space.

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Thanks for understanding!