Following is a sample code that I got from examples folder in the ModelingToolkit.jl. I added the last two lines to formulate the Problem. What are the possible reasons for the error in code " **Only semi-explicit constant mass matrices are currently supported. Faulty equation: source₊p₊v(t) ~ resistor₊p₊v(t).**". There are 26 states and 4 parameters whose default values were taken for the simulation.

```
include("electrical_components.jl")
@named source = ConstantVoltage(V=10.0)
@named resistor = Resistor(R=1.0)
@named inductor1 = Inductor(L=1.0e-2)
@named inductor2 = Inductor(L=2.0e-2)
@named ground = Ground()
eqs = [
connect(source.p, resistor.p)
connect(resistor.n, inductor1.p)
connect(inductor1.n, inductor2.p)
connect(source.n, inductor2.n, ground.g)
]
@named ll_model = ODESystem(eqs, t)
ll_model = compose(ll_model, [source, resistor, inductor1, inductor2, ground])
sys =ll_model
tspan = (0.0,100.0)
prob = ODEProblem(sys,[],tspan,[])
```