How to deal with FMUException: FMUSlave failed to initialize due to illegal character '!'

Question

I am trying a co-simulation of an FMU exported from an IDF file with PyFMI using a Python code. The FMU passed the validation process on fmi-standard.org. However, I get the error as mentioned in the object:

Traceback (most recent call last):
File ~\OneDrive\Documents\simulation.py:28 in <module>
model.initialize(time, timestop, True)
File src\\pyfmi\\fmi.pyx:3142 in pyfmi.fmi.FMUModelCS1.initialize
FMUException: The slave failed to initialize. See the log for possibly more information.

Here is the content of the output.log file

=== Input Error ===
File C:\Users\AUDIO-~1\AppData\Local\Temp\JModelica.org\jm_tmpv9m6k_r4\resources\heatrecovery.idf,
line 10: Encountered illegal character '!' while reading a token.

I checked the idf, but still can't fix the problem. I will appreciate any help on this.

Thank you. Theodore.