The dreaded Data Merge "There is at least one data placeholder that cannot be found" error
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.

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Matthew Anacleto commented
Had came across this issue today. I solved it deleting all placeholder frames and using the move pages to a new document. I had object styles for all the elements so it was a snap re-building.
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Andre commented
Great idea, avoid having to cross check the CSV and data labels!
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Anonymous commented
Worst game of hide and go seek ever! Come on make a noise little link!
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JD commented
I have the same issue and am unable to find the cause. It is inconsistent, sometimes it works, other times not. Agree entirely that Adobe should at a minimum highlight where the problem is to simplify troubleshooting!
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Vicky commented
I'm experiencing the same error as the previous user - It worked, then it didn't. I'm not using real info, just testing out a few columns.
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Anonymous commented
I'm also having this issue and just testing with 4 cells filled in with information, 2 row, 2 column + title and it's messing up. It worked and then it didn't