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"the model is structurally singular"

"the model is structurally singular"

I have a model that pass the check.
With [n , 1] array simulation work good.

With [n , m] array simulation don't start and there is an alarm:
"The problem is structurally singular.
It has 1220 scalar unknowns and 1220 scalar equations.
The Real part has 1216 unknowns and 1216 equations.
The Integer part has 4 unknowns and 4 equations.
The Boolean part has 0 unknowns and 0 equations.
The String part has 0 unknowns and 0 equations.

Attempting to further localize singularity.

Singularity of Modelica_EnergyStorages.Batteries.Stacks.Basic.LinearDynamicImpedanceMatrix is at the top level.

The model Modelica_EnergyStorages.Batteries.Stacks.Basic.LinearDynamicImpedanceMatrix is structurally singular,
when assuming the most generic outside couplings to all the flow variables of its connectors.

The problem is structurally singular for the element type Real.
The number of scalar Real unknown elements are 1216.
The number of scalar Real equation elements are 1216. "

What is the problem?

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Re: "the model is structurally singular"

For people who might see this with the same problem:

http://www.claytex.com/blog/getting-sta … ola-model/

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