Redmine

I'm running Redmine 2.6.6-0 on windows server and trying to install this plugin.
I'm trying to use this script -

...............

echo lam off

call "C:\\Bitnami\\redmine-2.6.6-0\\scripts\\setenv.bat"

cd "C:\\BitNami\\redmine-2.6.6-0\\apps\\redmine\\htdocs"

rake redmine:send_whining days=1 RAILS_ENV="production"

..............

and I keep getting this error
rake aborted!
LoadError: cannot load such file - (path to environment file)

How can solve this issue?

Thanks,
Snir.