Unusual Error with CP-SAT

[Hugh Walters]

First of all, thanks to the ortools team for their products and support.

I decided to upgrade my version of CP-Sat from whatever I had (9.9.x) to the latest version (9.10.x) and started to get this error when running all my python programs that referenced cp_sat.

  Windows fatal exception: access violation Main thread: Current thread 0x00003c08 (most recent call first): File "C:\Anaconda3\Lib\site-packages\ortools\sat\python\cp_model.py", line 3158 in solve File "C:\Anaconda3\Lib\site-packages\ortools\sat\python\cp_model.py", line 3334 in Solve File "z:\sfjssp_run.py", line 897 in semi_flexible_jobshop File "z:\sfjssp_run.py", line 1016 in <module> File "C:\Anaconda3\Lib\site-packages\spyder_kernels\py3compat.py", line 356 in compat_exec File "C:\Anaconda3\Lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 473 in exec_code File "C:\Anaconda3\Lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 615 in _exec_file File "C:\Anaconda3\Lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 528 in runfile File "C:\Users\hpswa\AppData\Local\Temp\ipykernel_30028\4101100766.py", line 1 in <module.

Needless to say I panicked and did all sorts of things.  I am developing in spyder and using anaconda and this has never been a problem before.  What worked was uninstalling the latest version and installing version  9.9.3963.  

Any insights into what may be causing the failure?

Best,

Hugh

[Laurent Perron]

Loot the release notes, stack overflow, github issues...

Both issue and fix have been documented 

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