Originally posted by: BhavnaJha

When I run this it shows the following:

I am attaching the .mod file.

<<< setup

<<< generate

Infeasibility row 'c131119':  0  = 7546.17.
Presolve time = 4.91 sec. (1067.18 ticks)

Root node processing (before b&c):
  Real time             =    6.94 sec. (1925.72 ticks)
Parallel b&c, 4 threads:
  Real time             =    0.00 sec. (0.00 ticks)
  Sync time (average)   =    0.00 sec.
  Wait time (average)   =    0.00 sec.
                          ------------
Total (root+branch&cut) =    6.94 sec. (1925.72 ticks)

<<< solve

<<< no solution

Even when I have named the constraints it doesn't tell which constraint  by name is causing the error. 

And I can't seem to find any logical flaws in the way I have constructed the constraints. Please let me know if you find any logical error or otherwise a way how I find out which constraint is creating infeasibility. 

Please help me.

Thank you in advance. 

Hi,

you Could watch

https://m.youtube.com/watch?v=tUALbhJ2xWY

regards

Since presolve detects infeasibility, you will have to run the conflict refiner without presolve. Do so

1. Export your model to a SAV file. Do this either by using option '-e [export-file]' of oplrun or by using the 'Export Format' setting in the .ops file.

2. Run the following commands in the interactive
CPLEX> read model.sav
CPLEX> set pre pre n
CPLEX> conflict
CPLEX> disp conf all

   This will give you a minimal conflict that shows the conflicting constraints/bounds.