[Coin-ipopt] INTERNAL ERROR: Unknown SolverReturn value - Notify IPOPT Authors.

[Sonia Singhal]

Hi,

I have integrated IPOpt in my code. It runs fine for smaller test
cases, but for all
bigger test cases ( variables > 1000 ) it executes for a long time and
gives me the
following error.

==========================================================================

Total number of variables............................:     6704
                     variables with only lower bounds:        0
                variables with lower and upper bounds:     6704
                     variables with only upper bounds:        0
Total number of equality constraints.................:     2271
Total number of inequality constraints...............:     7145
        inequality constraints with only lower bounds:        0
   inequality constraints with lower and upper bounds:     6704
        inequality constraints with only upper bounds:      441

iter    objective    inf_pr   inf_du lg(mu)  ||d||  lg(rg) alpha_du alpha_pr  ls
   0  4.1255458e+003 2.10e-001 1.34e+000   0.0 0.00e+000    - 
0.00e+000 0.00e+000   0
Exception of type: INTERNAL_ABORT in file
"IpPDPerturbationHandler.cpp" at line 253:
 Exception message: retval evaluated false:
get_deltas_for_wrong_inertia returns false.

Number of Iterations....: 0

                                   (scaled)                 (unscaled)
Objective...............:  4.1255458316100949e+003   4.1255458316100949e+003
Dual infeasibility......:  1.3383911269052646e+000   1.3383911269052646e+000
Constraint violation....:  1.0999978900000862e-001   1.0999978900000862e-001
Complementarity.........:  1.0000000099999999e+001   1.0000000099999999e+001
Overall NLP error.......:  1.0000000099999999e+001   1.0000000099999999e+001


Number of objective function evaluations             = 1
Number of objective gradient evaluations             = 1
Number of equality constraint evaluations            = 1
Number of inequality constraint evaluations          = 1
Number of equality constraint Jacobian evaluations   = 1
Number of inequality constraint Jacobian evaluations = 1
Number of Lagrangian Hessian evaluations             = 2

EXIT: INTERNAL ERROR: Unknown SolverReturn value - Notify IPOPT Authors.
IPOpt TIME : 12263 s

=========================================================================

Any ideas ?

Thanks,
~ Sonia
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