Using RestClient for communication between server and client

Hello,

I'm using class RestClient for communication between server and client. One example is:

params = {:status => "finished"} resource = RestClient::Resource.new "http://localhost:3000/BuildJob/220376999" begin    resource.put params, :content_type => 'text/plain' rescue Exception => err    puts err.to_s end

where "status" is a string field in model class "BuildJob" and "220376999" is the id of the BuildJob.

What I want to do is updating the field "status" in the model "BuildJob". I always get the error:

"HTTP status code 500"

I'm already using the following command to retrieve information about build jobs:

xml = RestClient.get "http://localhost:3000/BuildJob?status=pending"

This code is functioning without errors.

Any idea what's wrong?

Thanks Martin