gistfile1.txt

==> Waiting for Selenium RC server on port 4444... Ready!
==> Waiting for rails application server on port 3001... Ready!
11:08:53.065 ERROR - Failed to start new browser session, shutdown browser and clear all session data
org.openqa.selenium.server.RemoteCommandException: timed out waiting for window 'null' to appear
	at org.openqa.selenium.server.FrameGroupCommandQueueSet.waitForLoad(FrameGroupCommandQueueSet.java:569)
	at org.openqa.selenium.server.FrameGroupCommandQueueSet.waitForLoad(FrameGroupCommandQueueSet.java:526)
	at org.openqa.selenium.server.BrowserSessionFactory.createNewRemoteSession(BrowserSessionFactory.java:373)
	at org.openqa.selenium.server.BrowserSessionFactory.getNewBrowserSession(BrowserSessionFactory.java:124)
	at org.openqa.selenium.server.BrowserSessionFactory.getNewBrowserSession(BrowserSessionFactory.java:86)
	at org.openqa.selenium.server.SeleniumDriverResourceHandler.getNewBrowserSession(SeleniumDriverResourceHandler.java:733)
	at org.openqa.selenium.server.SeleniumDriverResourceHandler.doCommand(SeleniumDriverResourceHandler.java:399)
	at org.openqa.selenium.server.SeleniumDriverResourceHandler.handleCommandRequest(SeleniumDriverResourceHandler.java:370)
	at org.openqa.selenium.server.SeleniumDriverResourceHandler.handle(SeleniumDriverResourceHandler.java:129)
	at org.openqa.jetty.http.HttpContext.handle(HttpContext.java:1530)
	at org.openqa.jetty.http.HttpContext.handle(HttpContext.java:1482)
	at org.openqa.jetty.http.HttpServer.service(HttpServer.java:909)
	at org.openqa.jetty.http.HttpConnection.service(HttpConnection.java:820)
	at org.openqa.jetty.http.HttpConnection.handleNext(HttpConnection.java:986)
	at org.openqa.jetty.http.HttpConnection.handle(HttpConnection.java:837)
	at org.openqa.jetty.http.SocketListener.handleConnection(SocketListener.java:245)
	at org.openqa.jetty.util.ThreadedServer.handle(ThreadedServer.java:357)
	at org.openqa.jetty.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
Tue Apr 13 11:08:43 +0100 2010 selenium-client received failure from selenium server:
requested:
	cmd=getNewBrowserSession
	1=*firefox
	2=http://localhost:3001
	3=
	4=
received:
	"Failed to start new browser session: Error while launching browser"
	called from /Users/craig/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/1.8/timeout.rb:62:in `timeout'

Craig, did you ever figure out what was causing this error? I'm getting the same thing.

I spent a few hours looking into it but couldn't find the problem. We were going to switch to Capybara and use WebDriver in the future anyway so we just pulled this plan forward and that's going quite well now.

Sorry I couldn't be more help!