md error


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hi to everyone i compiled nwchem-6.6 on mac book pro successfully but i am not able to run md examples in every example i found always the same error for example for benzene is:

Created fragment bnz.frg_TMP

Unresolved atom types in fragment bnz


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* 0: pre_mkfrg failed 9999
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0::Received an Error in Communication
application called MPI_Abort(comm=0x84000000, 9999) - process 0

Please can you help me to solve this problem?

Thanks a lot for your patience

Dearly

lorenzo