atom selection problem


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Hello all,

I have a system containing heme, I build the fragment file and segment file for heme and another ligand that I'm gonna put into QM region. Then I set up the QM/MM optimization, however, NWCHEM kept looking for atom C in WAT.sgm, where WAT is standard water. Any suggestions?


Atom C not found in segment ./WAT.sgm

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* 0: pre_atmscn failed 9999
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Thank you!

Best,
Yue