JUNOS showing MRTG Out Value as nan

Hi Sir;

I am using Cacti (Attached) & Observium(Attached) for MRTG.When i am checking at cacti same port/device showing IN/OUT value whereas Observium is showing Out Value as "nan" and not graphs getting plotted for any interface.

Help know any thing specific required from my end to resolve issue

BR+
Rakesh