[Ipopt] Restoration Failed with one constaint only

[Lewis I]

Dear all,

I have the following problems when I ran my problem,
my problem only hv 24 variables, 1 obj. function  and 1 constraint.
The constraint is the function of 18 variables from that 24 variables.


Log:
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458 2.3928240e+003 2.01e+003 3.40e+008 -11.0 3.29e+001    -  1.00e+000 1.00e+000w  1
 459 5.9069378e+003 1.66e+003 8.61e+002 -11.0 2.13e+001    -  1.00e+000 1.00e+000w  1
Restoration phase is called at point that is almost feasible,
  with constraint violation 7.310133e-013. Abort.

Number of Iterations....: 459

                                   (scaled)                 (unscaled)
Objective...............:  9.4569553206125093e+001   9.4569553206125093e+001
Dual infeasibility......:  9.1622460109465753e-001   9.1622460109465753e-001
Constraint violation....:  7.3101334986695766e-013   5.8207660913467407e-011
Complementarity.........:  0.0000000000000000e+000   0.0000000000000000e+000
Overall NLP error.......:  2.2388529800870424e-005   9.1622460109465753e-001


Number of objective function evaluations             = 3081
Number of objective gradient evaluations             = 462
Number of equality constraint evaluations            = 3289
Number of inequality constraint evaluations          = 0
Number of equality constraint Jacobian evaluations   = 461
Number of inequality constraint Jacobian evaluations = 0
Number of Lagrangian Hessian evaluations             = 0
Total CPU secs in IPOPT (w/o function evaluations)   =      4.375
Total CPU secs in NLP function evaluations           =      0.016

EXIT: Restoration Failed!
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Regards,
Lewis