[Couenne] Couenne is declaring infeasibility of a feasible model

[Wendel Melo]

Hi everybody


I have an AMPL model to solve (in attachment). I have submitted to Couenne,
but it is declaring infeasiblity:


> ampl model_mmx_.mod inst3_.dat    couenne
Couenne 0.4.7 --  an Open-Source solver for Mixed Integer Nonlinear
Optimization
Mailing list: couenne at list.coin-or.org
Instructions: http://www.coin-or.org/Couenne
couenne:
ANALYSIS TEST:  Couenne: Warning, tightened NLP is infeasible
problem infeasible
Error at _cmdno 2 executing "solve" command
(file couenne.cmd, line 4, offset 28):
can't open /tmp/at2590.sol




However, I can get a feasible solution if I submit the the model to other
solvers like Bonmin, for example. Is there some parameter or tolerance that
I should set to remediate this? I have tried parameter "feas_tolerance",
but I have not had success.


Thanks in advanced


-- 
Wendel Melo
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