If you inserted field codes in your document, in order to find errors in it you can find them easily by following these steps;
1- Click on the Mailings tab.
2- In the “Preview Result Part” Click on the “Check for Errors”
3- In the “Checking and Reporting Errors” you have three options;
Click on the Simulate the merge and report errors in a new document.
4- Click Ok.
5- In the Invalid Merge Field dialogue, the program shows the errors.
You can remove that field.
You can also in the “Fields in data source” find the correct field.
6- Click Ok.
7- If you solved all errors in your file, after “Simulate the Merge and report errors in a new document” is chosen.
you can see “No mail merge errors have been found” message.
- Press Ok.