COMSOL Simulation at 50 degree celcius

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Hi. Iam trying to run the simulation of an Alklaine Electrolyser using Application library. I want to run the simulation at 50 degree celcius . At No gas evolution it gives me the Polarization curve but when run the simulation at Gas Evolution following error appears on the screen.

Volume Fraction Undefined value found. - Detail: Undefined value found in the equation residual vector. There are 1002 degrees of freedom giving NaN/Inf in the vector for the variable comp1.phid. at coordinates: (0,0), (0,0.0002), (0,0.0004), (0,0.0006), (0,0.0008), ...

Can any one help me in removing this error and what is the reason for this error... Regards


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