ApplicationError: Solver (gurobi) did not exit normally

Answered

Soravis Ratanapises

April 26, 2023 17:17

• 
• 
• 

Hi,
Im using python 3.11.2 and gurobi 10.0.1

I'm working on an optimization in python using pyomo.
The code works fine with GLPK solver.

When I change a solver from GLPK to gurobi, i encounter the following error.

ERROR: Solver (gurobi) returned non-zero return code (1)
ERROR: Solver log: File "<stdin>", line 3 SyntaxError: Non-UTF-8 code starting with '\xe4' in file <stdin> on line 3, but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details
---------------------------------------------------------------------------
ApplicationError Traceback (most recent call last) d:\OneDrive - Europa-Universität Flensburg\0. Master Degree EEM\Master Thesis\1. Thesis work\VS code\Master Thesis rev.13_partial load & cold start& guroby.py in line 5
281 #%%
282 #--------------------------------------------
283 # slove instance
284 solver = po.SolverFactory("gurobi") ---->
285 result = solver.solve(instance)
286 Op_time = result.solver.time/60
287 #--------------------------------------------
File d:\OneDrive - Europa-Universität Flensburg\0. Master Degree EEM\Master Thesis\1. Thesis work\VS code\NonLinearThesis\Lib\site-packages\pyomo\opt\base\solvers.py:596, in OptSolver.solve(self, *args, **kwds)
  594 elif hasattr(_status, 'log') and _status.log:
  595 logger.error("Solver log:\n" + str(_status.log)) -->
  596 raise ApplicationError( 597 "Solver (%s) did not exit normally" % self.name)
  598 solve_completion_time = time.time()
  599ifself._report_timing:

ApplicationError: Solver (gurobi) did not exit normally

I have tried putting,  # -*- coding: utf-8 -*- , at the beginning of the code but its still not working.

Thank you very much for your help.

Related to

• Pyomo

0

• 

  Riley Clement

  • Gurobi Staff

  April 27, 2023 23:59 Edited

  Hi Soravis,

  Can you try replacing

  solver = po.SolverFactory("gurobi")

  with

  solver = po.SolverFactory("gurobi", solver_io="python")

  and see if this resolves your issue?

  - Riley

  1
• 

  Soravis Ratanapises

  April 27, 2023 20:13

  • 
  • 
  • 

  Hi Riley,

  Thank you very much.

  It works.

  Best regards,

  Soravis

  0

Please sign in to leave a comment.