cordova create zkouska cz.Velda.zkouska zkouška on Mac (zkouška is test in czech), then add ios platform ends with error. It's because diacritics cannot be in project name. When I after that change <name> to zkouska, adding ios platform finish successfully. Don't confuse project name and application name.
When I add platform without diacritical project name, then build, error happens too. ------------------------------------------------------ What platform are you using? Cordova is multi-platform, so it's very helpful for you to start by identifying which one you're describing.