What's the meaning of 'Restoration phase is called at point that is almost feasible' or 'EXIT: Restoration Failed!' ?

[wgtfly]

Restoration phase is called at point that is almost feasible,
with constraint violation 1.287859e-14. Abort.

Number of Iterations....: 34

                               (scaled)                 (unscaled)

Objective...............: 3.4768989431905907e-03 3.4768989431905907e-03
Dual infeasibility......: 1.6816706373366094e-01 1.6816706373366094e-01
Constraint violation....: 0.0000000000000000e+00 0.0000000000000000e+00
Complementarity.........: 2.5267046426270557e-04 2.5267046426270557e-04
Overall NLP error.......: 1.6816706373366094e-01 1.6816706373366094e-01

Number of objective function evaluations = 367
Number of objective gradient evaluations = 36
Number of equality constraint evaluations = 367
Number of inequality constraint evaluations = 367
Number of equality constraint Jacobian evaluations = 36
Number of inequality constraint Jacobian evaluations = 36
Number of Lagrangian Hessian evaluations = 0
Total CPU secs in IPOPT (w/o function evaluations) = 0.077
Total CPU secs in NLP function evaluations = 1881.632

EXIT: Restoration Failed!

Hi professor, when I use dafoam to optimize, In the log file, objfunc may stagnate at a certain value and stop decreasing, and a prompt like this may appear. I want to know if this is normal or an error? If I want to continue to optimize to a lower value, what can I try? Here is the fully log.opt_IPOPT.txt