dll works fine in debug mode but not in stadalone

Dear all,

I have developed a Unity project (used version Unity 2019.3.0f5) in which I have used the TwinCAT.Ads dll. If I execute this project in the debug mode the program works fine (I am available to read and write the TwinCAT variables). However, if I generate the executable, I still be available to read the variables but I am not available to write on them due to the error “Encoding 1252 data could not be found. Make sure you have correct international codeset assembly installed and enabled”.

Does anyone know what could be doing on?

Thanks in advance,