What does the "nonlinear iteration is not converging" error mean?

What does the "nonlinear iteration is not converging" error mean? How do I debug this?

Nonlinear iteration is not converging with step size reduced to hmin (7.96349e-014) at time 22.4152. Try reducing the minimum step size and/or relax the relative error tolerance.

Answer 1

[MathWorks Support Team]

This can mean that one of the signals in your model is diverging to plus or minus infinity or is otherwise changing too rapidly based on the solver settings.