Sitemap plugin doesn't work

I can't get the sitemap plugin to work on our multisite installation. Using subdirs. Any ideas if this is fixable with my webhosting?

[11-Sep-2010 20:37:35] PHP Warning: is_dir() [function.is-dir]: open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp/:/storage/content/:/usr/local/lsws/lsphp5/lib/php/:/usr/local/lsws/share/:/storage/configuration/upload_tmp_dir/) in /storage/content/35/106035/xtravaganzablogg.se/public_html/wp-content/mu-plugins/simple-sitemaps.php on line 156
[11-Sep-2010 20:37:35] PHP Warning: mkdir() [function.mkdir]: open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp/:/storage/content/:/usr/local/lsws/lsphp5/lib/php/:/usr/local/lsws/share/:/storage/configuration/upload_tmp_dir/) in /storage/content/35/106035/xtravaganzablogg.se/public_html/wp-content/mu-plugins/simple-sitemaps.php on line 157
[11-Sep-2010 20:37:35] PHP Warning: is_dir() [function.is-dir]: open_basedir restriction in effect. File(/storage/) is not within the allowed path(s): (/tmp/:/storage/content/:/usr/local/lsws/lsphp5/lib/php/:/usr/local/lsws/share/:/storage/configuration/upload_tmp_dir/) in /storage/content/35/106035/xtravaganzablogg.se/public_html/wp-content/mu-plugins/simple-sitemaps.php on line 156
[11-Sep-2010 20:37:35] PHP Warning: mkdir() [function.mkdir]: open_basedir restriction in effect. File(/storage/) is not within the allowed path(s): (/tmp/:/storage/content/:/usr/local/lsws/lsphp5/lib/php/:/usr/local/lsws/share/:/storage/configuration/upload_tmp_dir/) in /storage/content/35/106035/xtravaganzablogg.se/public_html/wp-content/mu-plugins/simple-sitemaps.php on line 157
[11-Sep-2010 20:37:35] PHP Warning: Cannot modify header information - headers already sent by (output started at /storage/content/35/106035/xtravaganzablogg.se/public_html/wp-content/mu-plugins/simple-sitemaps.php:156) in /storage/content/35/106035/xtravaganzablogg.se/public_html/wp-content/sitemap.php on line 43
[11-Sep-2010 20:39:13] PHP Warning: is_dir() [function.is-dir]: open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp/:/storage/content/:/usr/local/lsws/lsphp5/lib/php/:/usr/local/lsws/share/:/storage/configuration/upload_tmp_dir/) in /storage/content/35/106035/xtravaganzablogg.se/public_html/wp-content/mu-plugins/simple-sitemaps.php on line 156
[11-Sep-2010 20:39:13] PHP Warning: mkdir() [function.mkdir]: open_basedir restriction in effect. File(/) is not within the allowed path(s): (/tmp/:/storage/content/:/usr/local/lsws/lsphp5/lib/php/:/usr/local/lsws/share/:/storage/configuration/upload_tmp_dir/) in /storage/content/35/106035/xtravaganzablogg.se/public_html/wp-content/mu-plugins/simple-sitemaps.php on line 157
[11-Sep-2010 20:39:13] PHP Warning: is_dir() [function.is-dir]: open_basedir restriction in effect. File(/storage/) is not within the allowed path(s): (/tmp/:/storage/content/:/usr/local/lsws/lsphp5/lib/php/:/usr/local/lsws/share/:/storage/configuration/upload_tmp_dir/) in /storage/content/35/106035/xtravaganzablogg.se/public_html/wp-content/mu-plugins/simple-sitemaps.php on line 156
[11-Sep-2010 20:39:13] PHP Warning: mkdir() [function.mkdir]: open_basedir restriction in effect. File(/storage/) is not within the allowed path(s): (/tmp/:/storage/content/:/usr/local/lsws/lsphp5/lib/php/:/usr/local/lsws/share/:/storage/configuration/upload_tmp_dir/) in /storage/content/35/106035/xtravaganzablogg.se/public_html/wp-content/mu-plugins/simple-sitemaps.php on line 157
[11-Sep-2010 20:39:13] PHP Warning: Cannot modify header information - headers already sent by (output started at /storage/content/35/106035/xtravaganzablogg.se/public_html/wp-content/mu-plugins/simple-sitemaps.php:156) in /storage/content/35/106035/xtravaganzablogg.se/public_html/wp-content/sitemap.php on line 43