kafka plugin is not working

[naweeng]

I have been trying to use kafka plugin for output, but I keep getting the error:

E, [2016-12-30T02:14:19.488332 #5261] ERROR -- FFWD: Output plugin #0: Not an available plugin 'kafka'

The strange thing is that when I run ffwd -d /opt/idx_ffwd/conf/ --plugins the output lists kafka plugin under both loaded and activated plugins.

Other plugins like riemann, json seem to work fine.

Any pointers on this would be appreciated.