Selenium Library Keywords throw exception and fails the test case

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Hi,

We are getting unusual result some times when running a test case.
The Selenium Library Keywords throw an error like "Exception" and fails the 
entire test case. 

The issue gets resolved when we kill the Grid Hub instance that is running in 
our server & started it again and re-registered the Selenium RCs configured in 
Hudson service.

Grid Hub version: selenium-server-standalone-2.31.0.jar

Please find below the Robot Framework's Error log
--------------------------------------------------------------------------

-+KEYWORD: SeleniumLibrary.Open Browser http://www.google.com, *firefox  
Documentation: Opens a new browser instance to given URL. 
Start / End / Elapsed: 20130423 09:01:41.786 / 20130423 09:01:48.848 / 
00:00:07.062 
09:01:48.845 INFO Opening browser '*firefox' to base url 
'http://www.google.com' 

-+KEYWORD: SeleniumLibrary.Maximize Browser Window  
Documentation: Maximizes current browser window. 
Start / End / Elapsed: 20130423 09:01:48.855 / 20130423 09:01:48.927 / 
00:00:00.072 

-+KEYWORD: SeleniumLibrary.Title Should Be Google  
Documentation: Verifies that current page title equals `title`. 
Start / End / Elapsed: 20130423 09:01:48.931 / 20130423 09:01:49.088 / 
00:00:00.157 
09:01:49.088 INFO Page title is 'Google'. 

+-KEYWORD: SeleniumLibrary.Capture Page Screenshot MainPage.png  
Documentation: Takes a screenshot of the current page and embeds it into the 
log. 
Start / End / Elapsed: 20130423 09:01:49.091 / 20130423 09:01:50.045 / 
00:00:00.954 
09:01:50.042 FAIL Exception 
--------------------------------------------------------------------------

Note:
In the above scenario Capture Screen Shot Keyword failed by throwing an 
Exception.

Please help us in resolving this issue since it has a huge impact.

Many Thanks in Advance...

Original issue reported on code.google.com by malarava...@gmail.com on 25 Apr 2013 at 6:43