Parameter 'Hash 1358960330' does not exist.

Questions & Answers
1

I was working on a project and my animations are not playing.

anim.SetFloat(vertical, v, 0.1f, Time.deltaTime);

I get the hash error when trying to play the game

2

SetFloat method comes in 4 variants (overloads):

public void SetFloat(int id, float value, float dampTime, float deltaTime);
public void SetFloat(int id, float value);
public void SetFloat(string name, float value);
public void SetFloat(string name, float value, float dampTime, float deltaTime);

and your code, i.e.:

    anim.SetFloat( vertical , v , 0.1f , Time.deltaTime );

assuming that both vertical and v are numbers, it matches this signature:

public void SetFloat(int id, float value, float dampTime, float deltaTime);

(4 numerical parameters)

In short, here is your call:

anim.SetFloat(
    vertical ,        // id
    v ,               // value
    0.1f ,            // dampTime
    Time.deltaTime    // delta time
);

hash is a numerical id. So this error means that animator has no parameter with an id equal to whatever values vertical has.