I am stuck at this Modules exercises of javascript

Hi I had been stuck on this exercise ‘Message Mixer’ now. Here’s my code:

I had done all exactly the same as the hint and even the walkthrough but the message.js keep telling me that MessageMixer.countCharacter is not a function :frowning: I don’t know what to do. please help

Remember that JavaScript is a case sensitive language.

MessageMixer != messageMixer.