You probably want to list what exact version of Lightroom, what platform and version, how you are exporting (there are many different ways) and to where on your device/computer. Also what do you mean by "empty"?
Lightroom Classic Version 12.6.2. File empty means that if you open the file, instead of the picture you have a black screen. I'm exporting using the export button on the left bottom side of the Lrc library screen