Can someone tell me what's wrong with this code, please? It says that Parameter 'Speed, 0f' does not exist.

Hi there! There are a couple of things going on here. First, you should be using the SetFloat method, but instead, are trying to use the GetFloat method. The GetFloat method takes either a string or an integer and you are passing in a string but it isn't matching anything it can "get". You can find more information on the GetFloat method in the Unity documentation.

You should be using SetFloat method. This method can have several different parameters it can take, but we want the first one documented in the Unity documentation. This takes a string and a float. But as stated before your entire parameter is one string, instead of a string and a float because it's all inside of one set of quotation marks. Also, note that the method was not intended to be private. Take another look at the code Nick wrote:

void FixedUpdate() { 
    if (movement != Vector3.zero) { 
        playerAnimator.SetFloat ("Speed", 3f); 
    } else { 
        playerAnimator.SetFloat ("Speed", 0f); 
}

Hope this helps!