Hack and sitemap problems

Hallo, I have few website with wordpress themes. I found so many problem now. The common problem is sitemap error. I have blog the auto update but why it happen agan and again? this is my website Balibur.com

Is there any relation with the keywords taken SEO Agency Jakarta?

I also have other website which is manually coding. This website is for real estate agent jakarta focus on house for sale in kemang, rumah dijual di jakarta selatan, apartments jakarta and many more