As I am new to linux, after a lot of struggle finally I installed all the tools and smokeping too but in the end I got the following error when I open the pages for the graphs,
"
Software error:

ERROR: creating /opt/smokeping/htdocs/cache/World: No such file or directory

For help, please send mail to the webmaster (webmaster@localhost), giving this error message and the time and date of the error.
"

plz help me.