Is this on Windows or Linux? What do you mean by decoding the FMU?

Oh, sorry, was unclear.
It's windows. By decoding FMU I mean creation of model in python through pyFMI

Ok. The problem might be in PyFMI while loading the FMU.
More questions:
What system do you have? 32bit? 64bit?
How did you installed PyFMI and FMIL?

System is 64bit, PyFMI and FMlob were installed through conda and worked on the older version of openmodelica. Both the new and the old versions of openmodelcia are 64 bit. The old one was downloaded 28th of may 2018, the newer is 15th of october

Thanks for the info. I'll give it a try on my system, see how it goes.

Thank you

Is there any news? Is it a common error or this problem occurs only at my machine?

Yes. I installed PyFMI via conda and tested with an OM FMU.
I get crashes in the sundials solver on both Windows and Linux and could not find out why yet.
The FMUs work fine in fmiChecker but they crash in python.
I suspect it might have something to do with stack alignment.
I even ran this in valgrind in Linux but got no clear idea what the problem is.
I will continue debugging this.

Ok, thank you for your involvement in my problem.