[mesa-users] running ./rn gives error

[Aaron Dotter]

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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