When you use the BARCODE field, one of the following WD2000 error messages displays in place of the POSTNET (POSTal Numeric Encoding Technique) bar code:
Zip code not valid!
No zip Code!CAUSEThe BARCODE field may generate this error for any of the following reasons:The BARCODE field in the mailing labels or envelopes mail merge main document refers to the wrong field or fields.
The ZIP Code portion of the mailing address contains invalid characters, such as nonbreaking hyphens, symbols, extra spaces, or other special characters.
The layout of the BARCODE field is incorrect.
There are three possible solutions to this problem:
The fields for the address or zip code are incorrect:
In the Word document, select the error message.
Press SHIFT+F9 to display the field codes.
BARCODE field codes display, where address1 is the field with the address and zipcode is the field with the zip code: