Hi, I am new here. If this is the wrong place to ask, please tell me.
I get error "1121: Can't crush solution form" on 8% of about 5000 test instances i am running.
I am on Cplex 22.1.0.0 using the Python API with python3.10. The error occurs after adding a user cut (via context.add_user_cuts(...)) in a generic callback. Without the cut the instances are fine.
I tried disabling presolve and other things e.g.
problem.parameters.preprocessing.presolve = 0
problem.parameters.preprocessing.dual = -1
problem.parameters.mip.strategy.presolvenode = 0
but they dont change anything and turning off presolve does not seem to work at all? because lines like
"
MIP Presolve eliminated 50 redundant SOS constraints.
Tried aggregator 2 times.
MIP Presolve eliminated 38 rows and 88 columns."
still show up in the logs.
I attached the stacktrace of the exception.
I have no idea how to investigate further and would be very grateful for input.
Best regards
Stephan
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Stephan Marnach
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