Getting Not defining \perthousnad and Not defining \micro when compiling beamer with Kile

They are not errors, but warnings from the gensymb package, and if you look in the .log file I think you'll find

Package gensymb Warning: Not defining \perthousand.

Package gensymb Warning: Not defining \micro.

So it has nothing to with either beamer or Kile. If you don't use those two symbols, don't worry about it. If you want to get rid of those warnings anyway, you can load the textcomp package before gensymb. (Reference: http://www.latex-community.org/forum/viewtopic.php?f=4&t=3364#p13124)

This error is generated by the textcomp packaged imported by gensymb. You can prevent it by explicitly importing textcomp before gensymb:

\usepackage{textcomp}
\usepackage{gensymb}

...