[Couenne-tickets] [Couenne] #33: Counne says "tightened NLP is infeasible"

[Couenne]

#33: Counne says "tightened NLP is infeasible"
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 Reporter:  thofrei                           |      Owner:  pbelotti
     Type:  defect                            |     Status:  new
 Priority:  major                             |  Milestone:
Component:  Couenne                           |    Version:
 Keywords:  infeasible Couenne tightened NLP  |
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 Dear CoinOr

 I'm trying to run a model in pyomo. One version of the model is using
 binary variables, which is why I'd like to use Couenne to solve it. In a
 second version of the model I have predefined these variables as
 parameters. I can solve the second version with Ipopt or Couenne and get a
 optimal solution. When I try to run the first version (which is basically
 the same model) with Couenne, however, I get the message:

 Warning, tightened NLP is infeasible problem infeasible
 ERROR: Unexpected exception while running model. [Errno 2] No such file or
 directory: '/tmp/tmpGAAINb.pyomo.sol'

 Do you know, what this means and how I can get my model to work? I am
 using Couenne 0.4.

 Thank you

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Ticket URL: <https://projects.coin-or.org/Couenne/ticket/33>
Couenne <https://projects.coin-or.org/Couenne>
Couenne, a solver for non-convex MINLP