You received this error when trying to move past Step 3: Contacts in the Create a Campaign Workflow:
WHAT DOES IT MEAN?:
In plain language, you have a merge tag in your email design that pulls data from one of your custom tables (ex. the Salesforce integration table). The segment(s) you are attempting to send to does not pull from that same table.
For example, this email is attempting to include the Account Name field from a Custom Table named "Customer Information":
The segment "London Leads" does NOT pull data from that segment. We cannot guarantee that subscribers included in the London Leads segment would have data in the Customer Information table.
This error prevents you from potentially sending an email that looks like the above rather than pulling in the information you intended.
There are two ways to fix this so that you do not encounter the error anymore and can move on to previewing and scheduling:
1. Remove the merge tag from your design. This is not the idea solution, so we recommend the next option.
2. Update your segment to pull an item from the custom table in question. This means either checking the box under "Advanced" when creating/editing the segment to include the table the merge tag pulls from:
OR using the table some way in the segment itself.
For example, I can add the clause "CustomerInformation.AccountName is NOT NULL". This means that data exists in the Account Name field and my email will not send with the raw merge tag showing.