Chris
The failure you are getting is caused by a failure/bug while reading the XC grid in the VSCF after the hessian calculation has been executed.
You can bypass this problem either by removing the task frequencies line in your input file or by forcing NWChem
to recreate the grid file by supplying the vectors input atomic line as in the input snippet below.
task dft optimize
task dft frequencies
dft
vectors input atomic
end
vscf
coupling pair
iexcite 1
end
task dft vscf
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