Hi everyone,
I am calculating just some small molecules in adduct formation and for some of them I encounter the following problem when setting up the Hückel matrix during the define step:
ERROR: non-positive definite matrix in Cholesky decomposition (routine: usad)
of overlap matrix in project.f
MODTRACE: no modules on stack
negative root in usad, see output
define ended abnormally
Has anyone of you an idea, what the problem could be?
Thanks.