PATH---Template OS Linux,Mounted filesystem discovery,Graph prototypes

The graphs look strange?why the total disk space is red??
So i want to change the graph prototype.
After i updated it and waited for some time,it didn't work.

Then i change the "Graph type" option,it returns some errs:
Undefined index: calc_fnc [graphs.php:624 ? CView->render() ? include() in include/views/configuration.graph.edit.php:347]
Undefined index: calc_fnc [graphs.php:624 ? CView->render() ? include() in include/views/configuration.graph.edit.php:347]

If you have any good news,pls send me an email: [email protected]

thks very much