I m trying to create a popup form that will send the info to Zoho Campaigns. This works until I need to add a custom filed and I get the error below. I cant figure out how to correct it: the field is on my form, and it is also in Campaign as a field for the email list.  How do I overcome this? Any help appreciated.

Note :  You can map a Campaign field only if there are corresponding fields in Zoho Forms.