Building Setup project errors.

VB Net application: after building setup project and installing it at the developers PC, run uninstall of this application. Next, when trying to build the same setup files, received bunch of errors:
‘Type AxMsComCtl2.AxAnimation is not defined” … path to the VB form which contains the control,
‘Type AxMsComCtlLib.AXListView is not defined” … path to the VB form which contains the control,
‘Type MsComCtlLib.ListItem is not defined” … path to the VB form which contains the control,

….
I noticed that all those errors referred to the objects from VB6 libraries (part of the project was upgraded from VB6 code).

So I repeated the installation again, and when trying to build the setup package, it now was built without any errors.
Anyone knows why it happened?