[Plugin: Google XML Sitemaps] Failed to open stream Warning

When I try to create an XML sitemap I get the following error. I did find the line in the sitemap-core.php file [line 1623]….however, I don’t know what to do, now that I’ve found the line in the code. I have not tried to fix the MySQL Queries note yet.

‘Errors, Warnings, Notices

Warning: fopen(/homepages/45/d295408252/htdocs/sitemap.xml) [function.fopen]: failed to open stream: Is a directory in /homepages/45/d295408252/htdocs/wp-content/plugins/google-sitemap-generator/sitemap-core.php on line 1623

MySQL Queries

Please edit wp-db.inc.php in wp-includes and set SAVEQUERIES to true if you want to see the queries.