When you get this sort of error try turning off autoz using 'noautoz' in the geometry block.
title "CS2"
charge 0
geometry units angstroms noautoz
symmetry c1
S 0.00000 0.00000 1.56240
C 0.00000 0.00000 0.00000
S 0.00000 0.00000 -1.56240
end
basis
* library 6-31G**
end
dft
xc b3lyp
mult 1
end
task dft energy