[mesa-users] running ./rn gives error

[Nikolai]

Hi Aaron,

I'm using gfortran.

     initial_Z = 0.0d0

did not work, but setting it to a small positive number did work. I'm 
not determined to evolve a metal-free star, so this solved it for me.

Thanks very much.

Nikolai

On 31.05.2012 13:19, Aaron Dotter wrote:
> Hi Nikolai,
>
> What compiler are you using?  We used to see this issue particularly 
> with gfortran.
>
> The error message that you received indicates that MESA tried to set 
> the initial composition of some species in the nuclear network to a 
> (very small) negative number.  That may be because you have
>
>          initial_Z = 0.00
>
> which is a real, not a double precision number, so it will add some 
> garbage to initial_Z.  If you try instead
>
>          initial_Z = 0.0d0
>
> this could solve the problem.  Otherwise, if you are not determined to 
> evolve a metal-free star, you could set to a small, positive number 
> just to run the example.
>
> Aaron

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