Robots.txt Allow Disallow

[Ben224]

Hello,

I am running version 5.1.1. And I am currently working on my overall search engine discoverability.

I note from looking at my robots.txt analysis in google webmaster tools that I have some crawl errors and I don't get it. I am using the robots.txt file that cubecart generates automatically as I assumed that this was the most appropriate configuration for the site?

Analysis results:

Line 1: Sitemap: sitemap.xml.gz

Invalid sitemap URL detected; syntax not understood

Line 2: Sitemap: sitemap.xml

Invalid sitemap URL detected; syntax not understood

Line 4: Disallow: cache/

No user-agent specified

Line 5: Disallow: images/

No user-agent specified

The disallow cache makes sense as pages change frequently. But I am wondering what the reasoning is behind the blocking of images? Also I cant figure out why the sitemap syntax is not understood. The path to the file is good as I can access the sitemap via my browser?

Can anyone throw some light on this?

Thanks in advance.