I am having the same issue and I went into the sitemaps.index.php file and changed accordingly:
define('DIR_WS_CATALOG', '/var/www/vhosts/merxmedia.com/subdomains/vintagestore/httpdocs/');
define('DIR_WS_HTTP_CATALOG', '/var/www/vhosts/merxmedia.com/subdomains/vintagestore/httpdocs/');
I am using plesk and think it may have something to do with the subdomain I am testing on, but am not entirely sure.
the test url is here
http://vintagestore.merxmedia.com/
The error I am getting is below:
ERROR: Google Product Sitemap Generation FAILED!
ERROR: Google Category Sitemap Generation FAILED!
ERROR: Google Sitemap Index Generation FAILED!
Array
(
[QUERY] => Array
(
[PRODUCTS] => Array
(
[sTATUS] => success
[NUM_ROWS] => 27
)
[CATEOGRY] => Array
(
[sTATUS] => success
[NUM_ROWS] => 20
)
)
[sAVE_FILE_XML] => Array
(
[0] => Array
(
[file] => /var/www/vhosts/merxmedia.com/subdomains/vintagestore/httpdocs//sitemapproducts.xml
[status] => failure
[file_exists] => false
)
[1] => Array
(
[file] => /var/www/vhosts/merxmedia.com/subdomains/vintagestore/httpdocs//sitemapcategories.xml
[status] => failure
[file_exists] => false
)
[2] => Array
(
[file] => /var/www/vhosts/merxmedia.com/subdomains/vintagestore/httpdocs//sitemapindex.xml
[status] => failure
[file_exists] => false
)
)
)
Any help is appreciated.
Martin