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Undefined value found

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Dear COMSOL Community

I have a question regarding the example of the Vanadium Redox Flow Battery (www.comsol.com/showroom/documentation/mode​l/14153/).
I have tried to simulate it but I get following error message:

Undefined value found.
- Detail: Undefined value found in the equation residual vector.
There are 858 degrees of freedom giving NaN/Inf in the vector for the variable mod1.cH_pos.
at coordinates: (0.004203,0), (0.004203,0.00233333), (0.004203,0.00116667), (0.004203,0.00466667), (0.004203,0.0035), ...
There are 2511 degrees of freedom giving NaN/Inf in the vector for the variable mod1.cV2.
at coordinates: (0,0), (0,0.00116667), (0,0.00233333), (0,0.0035), (0,0.00466667), ...
There are 2511 degrees of freedom giving NaN/Inf in the vector for the variable mod1.cV3.
at coordinates: (0,0), (0,0.00116667), (0,0.00233333), (0,0.0035), (0,0.00466667), ...
There are 858 degrees of freedom giving NaN/Inf in the vector for the variable mod1.cV4.
at coordinates: (0.004203,0), (0.004203,0.00233333), (0.004203,0.00116667), (0.004203,0.00466667), (0.004203,0.0035), ...
There are 858 degrees of freedom giving NaN/Inf in the vector for the variable mod1.cV5.
at coordinates: (0.004203,0), (0.004203,0.00233333), (0.004203,0.00116667), (0.004203,0.00466667), (0.004203,0.0035), ...
There are 2511 degrees of freedom giving NaN/Inf in the vector for the variable mod1.phil_neg.
at coordinates: (0,0), (0,0.00116667), (0,0.00233333), (0,0.0035), (0,0.00466667), ...
There are 858 degrees of freedom giving NaN/Inf in the vector for the variable mod1.phil_pos.
at coordinates: (0.004203,0), (0.004203,0.00233333), (0.004203,0.00116667), (0.004203,0.00466667), (0.004203,0.0035), ...
There are 656 degrees of freedom giving NaN/Inf in the vector for the variable mod1.phis_neg.
at coordinates: (0,0), (0,0.00233333), (0,0.00466667), (0,0.007), (0,0.00933333), ...
There are 239 degrees of freedom giving NaN/Inf in the vector for the variable mod1.phis_pos.
at coordinates: (0.004203,0), (0.004203,0.00233333), (0.004203,0.00466667), (0.004203,0.007), (0.004203,0.00933333), ...



Could you help me locate the problem?

With kind regards,
Michael Remy

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