Warning: "zero diffusivity"
 

I have a heat & mass transfer problem (fuel cell).
When I initialize the calculation, the following warning comes up:

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Warning: Mass_Diffusivity: invalid (zero) diffusivity.
Please check material properties.
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I'm utilizing "Multicomponent" scheme in "Mass diffusivity" panel of the defined "Mixture" and set all Dij to 0.00005.

That means there is no "zero diffusivity" in the system.

So why should I get this warning?

Your reply is highly appreciated.

Masoud