(Deployment) GH pages

On Windows, the deployment on github pages seems not to be working.
When trying to deploy, and executing the rsync command, the following error occurs:

    rsync -rl --exclude .git --delete "C:/Users/travis/build/gegelati/gegelati/neutral_builds/" .
    The system cannot find the path specified.
    The system cannot find the path specified.
    The system cannot find the path specified.
    Switched to a new branch 'gh-pages'
    failed to deploy
    ssh: Could not resolve hostname c: Name or service not known
    rsync: connection unexpectedly closed (0 bytes received so far) [Receiver]
    rsync error: unexplained error (code 255) at io.c(226) [Receiver=3.1.2] 

The complete log (and config) are available here :
https://travis-ci.com/gegelati/gegelati/builds/135472709

Problem was already raised in Gh-pages deployment failing, but left unsolved after the author simply de-activated deployment for windows.

EDIT: Result is not better with dpl v1:

failed to deploy
C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/lib/dpl/provider.rb:97:in `rescue in block in new': uninitialized constant DPL::Provider::Pagesgit (NameError)
	from C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/lib/dpl/provider.rb:68:i `block in new'
	from C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/lib/dpl/cli.rb:41:in `fold'
	from C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/lib/dpl/provider.rb:67:in `new'
	from C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/lib/dpl/cli.rb:31:in `run'
	from C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/lib/dpl/cli.rb:7:in `run'
	from C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/bin/dpl:5:in `<top (required)>'
	from C:/tools/ruby26/bin/dpl:23:in `load'
	from C:/tools/ruby26/bin/dpl:23:in `<main>'

C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/lib/dpl/provider.rb:72:in `block in new': could not find provider "pagesgit" (DPL::Error)
	from C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/lib/dpl/cli.rb:41:in `fold'
	from C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/lib/dpl/provider.rb:67:in `new'
	from C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/lib/dpl/cli.rb:31:in `run'
	from C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/lib/dpl/cli.rb:7:in `run'
	from C:/tools/ruby26/lib/ruby/gems/2.6.0/gems/dpl-1.10.13/bin/dpl:5:in `<top (required)>'
	from C:/tools/ruby26/bin/dpl:23:in `load'
	from C:/tools/ruby26/bin/dpl:23:in `<main>'
Imprint