Cacti

hi any one can give me solution i have installed cacti 0.8.8b in centos graphs are not displaying RRDTool Command: /usr/bin/rrdtool graph - \ --imgformat=PNG \ --start=-86400 \ --end=-300 \ --title='mydevice - mydevice Disk Usage' \ --rigid \ --base=1024 \ --height=120 \ --width=500 \ --alt-autoscal...