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Preprocessor hangs up

I am trying to update a model from the 2002-2003 timeframe to the current 3.6 version. I think I'm about there, but when I run the preprocessor, it hangs up and there is nothing written to the PRE.OPT, PRE.WRN, and PRE.ERR files. I think my most recent snag is in the GRAPH.NPT file, if that helps. Thanks, Brian
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Hi Brian, I'd make sure that the number of constituents that you have listed in your graph.npt file is the same as you have in your control file. Chris