Your feed gets generated but as i can see you get an error :
xmlParseEntityRef: no name
the error is caused by :
There is a stray ‘&’ (ampersand character) somewhere in the XML text eg. some text & some more text
You need to use HTML numbers so & should be '& amp;' > should be '& gt;' in your product category and google category.
In your particular case
Health & amp; Beauty & gt; Personal Care & gt; Hair Care & gt; Shampoo & amp; Conditioner
eliminate the space between & and gt; and & and amp;