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Synthia BeauvaisSynthia Beauvais 

URL Hack- "Error: Multiple items found

I am getting "Error: Multiple items found. Select from drop-down or click icon to refine search." for the below URL hacks. The field that is getting this error is Account Name (Custom Field). I am unable to locate the fields ID. I've downloaded the WSDL and looked at the page source and I am still not able to locate the field ID.

Is there anywhere else I can locate the ID for a custom field? 

Opportunity Object
Account Object

This is what's present for the URL. 

Thanks in advance!
Go to that custom field from Setup>Objects> and you will see the Id in the url. Something like this where 00NA000000AGJyg is the id of the custom field
Synthia BeauvaisSynthia Beauvais
This is the URL I get.
Synthia BeauvaisSynthia Beauvais
This is the URL I get when I go to a specific field in the Account Object.
For standard fields, Id is their api name. So, for field Name, the id will be Name