Error in AirLoopHVAC

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Hello, I have been working on Template of building model for 3 zone space, later will be implemented on Big building simulation. As I got reply from energyplus support team to get humidity control to the building model, I am working on the AirLoopHVAC and On the branch I am assigning the Humidifier and Fan:variableVolume. and I am getting errors like -

** Severe ** SizeAirLoopBranches: AirLoopHVAC AIRLOOPHVAC has air flow less than 1.0000E-003 m3/s.
** ~~~ ** Primary air system volumetric flow rate = 0.0000 m3/s.
** ~~~ ** Check flow rate inputs for components in this air loop and,
** ~~~ ** if autosized, check Sizing:Zone and Sizing:System objects and related inputs.

please have a look and let me know where I am doing wrong or even is this posible? I have set the air flow rate to autosize but still not getting value in output for the Humidification. or do I need to set minimum air flow rate somewhere ?

Please have a look. Thanks in advance .... Yagnik