Entry Form: Populate checkbox list from another entry and save options in entry I am trying to load some options in to a checkbox list from another entry so that a user and save select them form a checkbox list but I am unable to save the Entry Form with their selection.

I have created the registeredOccurances checkbox field in the Section, it has no options set as I want to set them on the entry form.

&lt;input type="hidden" name="fields[registeredOccurances]" value=""&gt;    
    {# Load rows from SuperTable in to checkbox list #}
    {% for block in entry[dateFieldHandle] %}
        &lt;label&gt;&lt;input type="checkbox" value="{{ loop.index }}" name="fields[registeredOccurances][]"&gt; {{ block.date }}&lt;/label&gt;
    {% endfor %}

    {% if entry is defined %}
        &lt;p&gt;{{ dump(entry.getErrors()) }}&lt;/p&gt;
    {% endif %}


The dump is outputting the below, can someone help to interpret it?

array(1) { ["registeredOccurances"]=&gt; array(1) { [0]=&gt; string(33) "Registered Occurances is invalid." } }

Thanks for your help :)
Could this be a reserved word? Generally I access fields using entry.registeredOccurances is there a reason you are using fields[registeredOccurances] and entry[dateFieldHandle]?