CNUT isn't able to read configuration file

I’m new with using CNUT and I cannot find out what’s wrong. When I set configuration, I save it, but I’m not able to retrieve it. It says “The Network Archive File could not be read by Network Updater”.
Has anyone know where is the problem?
Thank you.

This is a known issue. It is caused by characters that would be
non-standard in English being used for Site Name, Site Contact, or Site
Location. The current workaround is to remove those characters from those
fields on the radios before you enable those fields in CNUT.