Could not load the bundler gem

my server after getting restarted is throwing this error :

Caused by: org.jruby.exceptions.RaiseException: (RuntimeError) Could not
load the bundler gem. Install it with `gem install bundler`.
Apr 7, 2011 10:32:15 AM org.apache.catalina.core.ApplicationContext log
SEVERE: Application Error

Can anyone suggest the reason for this?

Regards,
Keshav.

Is the bundler gem installed on the server? It may have been removed and you were not aware of it.

B.