Control File: a required field is missing
All valid Control Files include a minimum set of fields. That minimum set includes all the fields marked as mandatory on the Control Files page. For example, the Package field is mandatory.
VALIDPackage: wpkg
Version: 0.7.3
Architecture: all
Description: Best package system for MS-Windows and Linux
Maintainer: Alexis Wilke (alexis@m2osw.com)
INVALIDPackage: wpkg
Version: 0.7.3
Note that these fields are all mandatory in a .info control file where the Sub-Package field is also mandatory.