Dear All,

Nice to know you all. I am a new user of Mathematica and just joined this community by today. I hope that I can have discussions with you. Currently I am running a script to obtain some parameters by using FindFit command. While running the script, I got many error messages (please refer to attach.)

So may I know the meaning of each error message? What is DAE? What is the meaning of the DAE solver failed at t=29.01. The solver is intended for index 1 DAE systems and structural analysis indicates that the DAE is structurally singular.

Is that t referring to the t of my simulation? In this case, my simulation time is from t=1 to t=101. If that error message means that there is something wrong at t=29.01, so what went wrong? There are also other error messages such as NDSolve::nderr: Error test failure at t=77.69, unable to continue.

I am not sure what went wrong so I am looking forward to receive your advises. Thanks for your attention and have a nice day.

Best Regards, Intan

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