I am trying to solve a nonlinear optimization problem using Pyomo. At first, I tried the Ipopt solver and I got the things running. I then wanted to try the solver Scip to try for global optimization since Ipopt is a local solver. However, I get an error that I can not understand while using it.

Getting Scip working with Pyomo was not straightforward, however through some help on internet and through some trial and error, I was able to get scip executable for windows from here. I named the executable as scipampl and added it to my PATH.

Pyomo is able to see the solver as when I run the following command, it returns True.

SolverFactory('scip').available() 

Feeling confident that I got the things working, I then tried to run my code. I setup my Solverfactory as follows:

solver     =  'scip'               
solver_io  =  'nl'                  
opt        =   SolverFactory(solver, solver_io = solver_io)

But to my disappointment, I receive the following error in the end:

[Errno 2] No such file or directory: 'C:\Users\NITINN~1.SIN\AppData\Local\Temp\tmpc0hzo5_7.pyomo.sol'

I have tried to look on the internet as to what does this mean, but so far I have been out of luck. I would appreciate if anyone can throw some light over what the possible cause for this might be ?

Thanks.