Custom Function to pull info from Deal to Contacts

Hello,

I'm trying to build a function in Zoho CRM to copy information from our Deal (called Opportunity in our production environment) over to the contact. Each deal relates to a single retail chain (walmart, target, etc). A contact may have multiple deals associated with them. So I have created a field on our deal called Chain where the sales team puts in the chain associated with that deal. On the contact is a multi-value field called Chain.

My code is such:

relatedcontacts = zoho.crm.getRelatedRecords("Contacts","Deals",dealsId.toLong(),1);

//info relatedcontacts;

for each ele in relatedcontacts

{

mp = Map();

mp.put("Chain",Chain);

update = zoho.crm.updateRecord("Contacts",ele.get("id").toLong(),mp);

info mp;

info update;

}

I have the following arguments mapping:

Arguments Mapping

I'm getting the following error message:

Argument type mismatch - Found 'TEXT' but Expected '[BIGINT]' for the function 'get'at lineNumber 9

Any guidance on how to resolve is appreciated. Thank you.