VMtools installation problem on Ubuntu 13.04

Hi,

I  have a vm (workstation 8.0.6) running with ubuntu 13.04 64 bit - I am trying to install vm tools, but am getting this error in the middle of the installation:

"The path "" is not a valid path to the 3.8.0-19-generic kernel headers"

It gives me this error all the time, even after I did sudo apt-get update && sudo apt-get install build-essential linux-headers-$(uname -r)

Any suggestions?

Thanks!