when using Data Merge, so many of us have gotten the "There is at least one data placeholder that cannot be found in the data source. Make sure all the placeholders correspond to the fields in the data source." error and have spent way too much time trying to find the issue.

Can Adobe add a way to highlight what InDesign is objecting to when this message happens?

This morning, I gave up and inserted the text manually. There were only 4 elements on each of my 5 Master pages and I could not find the offending object.