Cacti RRD file not creating

Error:: messages.

"there are no rra's assigned to local data id"
or
"RRDTool Says:
ERROR: opening '/var/ww/html/cacti/rra/sw-new_traffic_in_28.rrd': No such file or directory"

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Check host template

Login- to cacti web by admin -> Click "Console" => Click "Data Templates" =>

Select all "Daily", Monthly, Weekly, Yearly
Select a template "Interface- Traffic" ->  Associated RRA's
                                                               This field is always templated.  

Select all "Daily", Monthly, Weekly, Yearly

and Save.

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