HashMap cannot cast other type?

public Human setName(){ Human a=null;

    System  .out.println("change name ");
    System.out.println("enter Security No : ");
    String inputsecNo=sc.next();

    System.out.println("enter name you wish to change : ");
    String name=sc.next();
    Human value=null;
    value= humanList.get(inputSecNo);
    value.setName(name);

I don't know why this error occur... I made a HashMaphumanList and want to get value of key(String). it says HashMap cannot be cast to Human... i used iterator to get value of map. but it occur same error.

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