Yea, that "cannot resolve symbol" error always means that a method, variable, class, etc, simply doesn't exist as far as the compiler is concerned. There's no method that takes a character, and that's what you were trying to call.
The "as far as the compiler is concerned" is an important part of that statement, because it often happens that it can't resolve classes that you're convinced it should know about. That usually means your classpath doesn't reference the class and the compiler can't find it.
sev