amforms no error handling
Ahh this is a bit misleading because the docs don't really spell it out. "formHandle" according to the docs really feels like it might be the variable you set your form to, but it's literally the form handle you got when you titled your form in the CMS.

So if your form starts with:

{% set apple = craft.amForms.getForm('fireTruck') %}

your error code needs to be this:

{% if fireTruck is defined %}
    {{ errorList(fireTruck.getErrors('someField')) }}
{% endif %}


and not this:

{% if apple is defined %}
    {{ errorList(apple.getErrors('someField')) }}
{% endif %}