Sounds like you might not have your package's parameters file set up on the server, but I'm guessing at this point. User::rs_bar
means you defined a variable called rs_bar
in your package. Are you setting that variable in your package code somewhere? If so then confirm that whatever it is using to get data is set properly on the server.
If you are using package parameters then ensure that your parameters file is being included in your deployment to the server and that the package is using the parameters. See here for information on using the parameters when deployed.