watch file problem

[Jaromír Mikeš <mira.mikes@seznam.cz>]

Hi all,

I am building package from source downloaded here:
https://launchpad.net/invada-studio/+download

and this is file I would like to monitor by watch file:
invada-studio-plugins_0.3.1-nopkg.tar.gz 

I tried this forms in watch file:
https://launchpad.net/invada-studio/+download/invada-studio-plugins_(.*)\.tar\.gz 
https://launchpad.net/invada-studio/+download/invada-studio-plugins_(.*)\-nopkg\.tar\.gz
https://launchpad.net/invada-studio/+download/invada-studio-plugins_(.*-nopkg)\.tar\.gz

I tested watch file and get always error output 
$ uscan --report-status
uscan warning: In debian/watch,
  no matching hrefs for watch line

Is fault on my side or form of monitored file is not valid for watch file?
Upstream would like to have two different sources on this sites:
1)with debian directory for people which would like to make their own packages
2)without debian dir for debian packaging needs

Thanks for advice/help

mira