I am trying to increase the traffic to my website but I am getting weird Crawler Errors from Google. Google is telling me that it visited the URL below, but it doesn't exist. My *sitemap.xml* doesn't have any invalid URLs.

```
http://www.example.com/AboutUs/AboutUs

```

But the URL above that Google visited is not written in any part of my website, where does Google find that URL? the correct version of the URL is below

```
http://www.example.com/AboutUs

```

Another example is like below, the URL below is not valid

```
http://www.example.com/ContactUs/AboutUs

```

The correct URL is 

```
http://www.example.com/ContactUs

```

or

```
http://www.example.com/AboutUs

```

Why does Google misunderstand my URLs? How can I fix this?