I struggled for a bit on trying to make this error message clear so I would love some help on this. what this is saying is at time t=218.2272500679591, the simulation’s dt (difference between the current time and previous time) has been forced down to 2.842170943040401e-14, and even with that small a dt, the error estimate was greater than 1, which means that the step had too large an error for us to accept the time step even at this miniscule dt.
This causes a problem since this value of dt is less than or equal to eps(218.2272500679591), so if we tried to take steps, those steps would not advance time do to floating point error e.g. `t+dt/2 == t.
Generally this warning happens when the problem you are trying to solve is mathematically unsolvable (e.g. your u or du/dt go to infinity in finite time), or you have a bug in your implimentation.