I've tried to create a data merge document but When I try to view appear a msg:
"It is not possible to find at least one placeholder for data in the data source. Verify all field placeholders in the data source"
I Tried with a simple archive and the same msg.
If i understand the message you are seeing, it means that you have a placeholder in your InDesign document that does not exist in your CSV file.
It's hard to tell from just a screen shot - if you could share your actual csv file (with maybe a line or two of data in it) and the InDesign file, it would be easier to troubleshoot this.
Off course, see attatched.
The problem occur when a put on reference in layout and try to preview or generate a document.
Thanks for helpin, by the way there is a program or website that verify the data inside the spreadsheet?