I am trying to run a closed loop in Dymola and I get this error
Error - Scalar system is always singular (for x=0) - Failed to start model
for the parameter that is involved in most equations in this closed loop.



So far I have tried

1.
Real x(start=700);
Real (fixed=true, start=700);

It gives the same error as above.

2.  mf_Water_CHP_In is X actually
initial algorithm
//mf_Water_CHP_In := 700;

initial equation
  //mf_Water_CHP_In=700;

Then I get this error
The initialization problem is overspecified for variables of element type Real.
The initial equation
mf_Water_CHP_In = 700;
refers to variables, which all are known.
To correct it you can remove this equation

After searching all related results to the issues that I get, I couldnt find any other idea
how to "initialize" / start the model.

Any suggestion is appreciated. Thanks