There are two situations in which the bar code software has blank preview: one is that there are empty objects on the label, and the other is that there are characters.
Empty object: Gu Mingsi added an object to the label, such as plain text, inserted picture and barcode QR code, but there is no data in these objects (the default data was deleted, but no new data was added, resulting in the object being empty). The solution of this preview blank is to add data to the data source of the empty object, or delete the empty object directly.
& ltEmpty > Character: there is no data or only characters in the data source of the data object, or data and characters, as shown in the following figure. Solution: add data without adding data, only delete characters, and then add data, data and characters are processed? & lt empty > just delete the characters.