How to write custom function in Zoho Platform for a portal/extension?

Hi,

I am working on extensions in Zoho Platform. Here I am following the help guide of Zoho Platform. i.e.

https://www.zoho.com/developer/help/extensions/quick-start.html

Here I am trying to create Workflow in Zoho extension to perform some automated tasks. But I am getting an error while executing my code.

The code is:

void workflowspace.Roll up amount to account(map potential)

{

accountid = input.potential.get("ACCOUNTID");

potentials = zoho.crm.searchRecords("Potentials", ("(ACCOUNTID|==|" + accountid) + ")");

//potentials = zoho.crm.searchRecordsByPDC("Potentials", ("ACCOUNTID"), accountid);

total = 0.0;

for each potential in potentials

{

stage = input.potential.get("Stage").toLowerCase();

if (stage.contains("won"))

{

total = (total + (input.potential.get("Amount")).toDecimal());

}

}

updateResp = zoho.crm.updateRecord(("Accounts"), accountid, { "REVENUE_POTENTIAL" : total });

And the error is:

Please help me to get the solution of this problem.

Thanks

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