Upload macOS application to Apple Store

Hi I have developed in C++ with Qt/QML an application that I want to distribute from Apple Store. When I try to upload the application from Xcode I get this error:

Build number in request, "", has an invalid format. Build number can only contain numeric characters (0-9) and periods.

I have verified that both version and build are present and have the correct format. How this could be solved ? thanks Bogdan