error after running a test in selenium rc+phpunit

Question

Hi,

I'm running the following test in selenium-rc:

<?php

require_once 'PHPUnit/Extensions/SeleniumTestCase.php';

class Example extends PHPUnit_Extensions_SeleniumTestCase
{
  protected function setUp()
  {
    $this->setBrowser("*firefox /usr/bin/firefox");
    $this->setBrowserUrl("http://www.google.com");
  }

  public function testMyTestCase()
  {
    $this->open("http://www.google.com");
    $this->type("q", "test");
  }
}
?>

And the log is this:

 Appending missed logging messages
 Executing: |getTitle | | |
 Executing: |setContext | ec1e83fb41564d6bb0fe1b85c2a34411 | |
 Executing: |setTimeout | 30000 | |
 Executing: |open | http://www.google.com | |
onXhrStateChange(): xhr.readyState = 1 method = HEAD time = 1287564690295
 onXhrStateChange(): xhr.readyState = 1 method = HEAD time = 1287564690295
 onXhrStateChange(): xhr.readyState = 2 method = HEAD time = 1287564690923
 onXhrStateChange(): xhr.readyState = 3 method = HEAD time = 1287564690923
 onXhrStateChange(): xhr.readyState = 3 method = HEAD time = 1287564690927
 onXhrStateChange(): xhr.readyState = 3 method = HEAD time = 1287564690930
 onXhrStateChange(): xhr.readyState = 3 method = HEAD time = 1287564690934
 onXhrStateChange(): xhr.readyState = 3 method = HEAD time = 1287564690936
 onXhrStateChange(): xhr.readyState = 4 method = HEAD time = 1287564690936
 Executing: |type | q | test |
* error(1287564696975): saw blank string xmlHttpForCommandsAndResults.responseText
* info(1287564703684): Done appending missed logging messages
* error(1287564703684): Log window displayed. Logging events will now be recorded to this window.

I don't understand why there are errors:

 error(1287564696975): saw blank string xmlHttpForCommandsAndResults.responseText
 info(1287564703684): Done appending missed logging messages
 error(1287564703684): Log window displayed. Logging events will now be recorded to this window