Problem with sitemap

Hello,

I just checked in WT and my sitemaps have error. When I try to open them directly I get this error in browser:

XML Parsing error: No element found
Location: http://mysite/sitemap_1.xml.gz
Line Number 1, Column 1:

------------------------------
and after second get me to this message:
------------------------------------
Content Encoding Error


The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.


I just moved to new server and it doesn't work there while it work on old one.. What can be problem? What I am missing?

I contact my new host and they said there is gzip on server and it is not a problem.
This is answer from them:

The problem isn't with gzip, rather it looks like whatever is being used to generate this gzip file is putting html at the top of the file, which will break the gzip file. In particular, it looks like the script used to generate the sitemap is producing an error. See below.

mstandley@dell-desktop:~$ cat sitemap_1.xml.gz | head -n2

Deprecated: Function set_magic_quotes_runtime() is deprecated in /home/serbian1/public_html/vbseo_sitemap/vbseo_getsitemap.php on line 70

If I manually remove those lines, the resulting file is a valid gzip archive. So correcting the code that causes that warning to be displayed should fix your problem.

It looks that host managed to make it work

If you are on php 5.3, you will need to edit the script as this post describes:
vBSEO Sitemap 2.5: PHP Deprecated: Function set_magic_quotes_runtime() is deprecated