ODE solver warning.

I am trying to use an ODE solver, however I keep getting the following warning or similar depending on what ODE I use.

Warning: Failure at t=1.411226e+00.  Unable to meet integration tolerances
without reducing the step size below the smallest value allowed (3.552714e-15)
at time t. 
> In ode15s (line 668)
  In AP2016 (line 47)

Would anyone know how I fix this? I am trying to get my script to simulate 0-900 days. It works fine when I am running the script for just 1day.

Thanks in advance

Answer 1

[Walter Roberson]

It basically means that you have a singularity.