Solver (ASL) did not exit normally

[Aml8992]

Hi all,

I had been successfully running a linear model with glpk, but added complexity and have been trying to run the now nonlinear model with bonmin. Even using the older linear .py and .dat files, I am getting the following recurring error when attempting to run with bonmin:

ERROR: "[base]\site-packages\pyomo\opt\base\solvers.py", 570, solve

Solver (asl) returned non-zero return code (3221225786)

ERROR: "[base]\site-packages\pyomo\opt\base\solvers.py", 573, solve

See the solver log above for diagnostic information.

[   75.48] Pyomo Finished

ERROR: Unexpected exception (ApplicationError) while running model H:/ERD/ANCHOR/Assignments/07_WMOSTEnhancement/02_WMOSTcoding/WMOSTv3/WMOSTv3coding_WQ/WQ_Debugging/Wmodel.py:

Solver (asl) did not exit normally

when using the following code:

pyomo solve Wmodel.py Wdata.dat --solver=bonmin --keepfiles --stream-solver --symbolic-solver-labels

I included the option to keep files, but although file paths are printed, they do not exist.In addition, I tested the bonmin executable on several example files and was able to get a solution and produce solver log files.

Any help would be appreciated!

Thanks,

Alyssa

[Bethany Nicholson]

This is just a guess, but usually when I see that error for nonlinear models it's because I haven't provided a good initialization for my variables and somewhere I have a constraint expression that cannot be evaluated at the default initial values of 0 (ex. dividing by zero). I'd recommend checking your model initialization as a first step and if that doesn't fix the problem then you should post a more detailed solver log and more information about your model.

Bethany

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