Hi there!
I am working on my company site hanoiguide.net. In a few days ago, i have found out sitemap.xml file is error and un-useable. I cann't re-update sitemap. Because i don't have hosting account information. Unfortunately, I have no way to get hosting account information from my boss. My question is Can i do something to make my site rank highly on google SERPs with the particular keywords?

If your sitemap.xml file is erroring out, you'll want to make sure that you aren't linking to that sitemap from your robots.txt and you'll also want to make sure that it isn't listed in your Google Webmaster Tools.

Hi,

Sitemap error can rectify in c-panel itself. So, without having the hosting details unable to solve it.

For this issue you should have to go for few settings on robots.txt file.