nwchem qmmm example6 fails

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dear nwchem users

I am trying to run qm/mm example6 provided in nwchem website, but the example fails. Here is the input taken from the nwchem web page.


 start wtr

 permanent_dir ./perm
scratch_dir ./data

 prepare
source wtr0.pdb
new_top new_seq
new_rst
modify segment 1 quantum
center
orient
solvate box 3.0
update lists
ignore
write wtr_ref.rst
write wtr_ref.pdb
end

 task prepare

 md
system wtr_ref
end

 basis
* library "6-31G"
end

 dft
xc b3lyp
end

 qmmm
bq_zone 3.0
end

 task qmmm dft energy
task qmmm esp




The error message reads as follows.



Created fragment WTR.frg_TMP

Unresolved atom types in fragment WTR


**********
* 0: pre_mkfrg failed 9999
**********

The error message indicate that atom types in fragment WTR are not found, but this is example file on the nwchem tutorial.
The corresponding fragment file wtr.frg was downloaded. Do I need other files which are not described on the web page?


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