Problem with Nmap

Hi,

I've installed kali linux on an virtualBox virtual machine an tried no

nmap

my problem ist that when i try

"nmap -sS -oA nmap/hosts --stylesheet=nmap.xsl --open reason 192.168.1.1-254"

i get the error message

"Failed to open normal output file nmap/hosts.nmap for writing

QUITTING"

What can i do to solve this problem ?