No graphs in the main page

[Aneu]

i have just installed cacti and i can't see any graphs in tree view or preview mode... if i click those titles, i can see the daily, weekly, monthly and yearly statistics... what is happening?

[gandalf]

This is usually due to a version mismatch between "rrdtool -v" and the "Settings -> RRDTool Utility Version"
Reinhard