Error On updating civievent participants.

I have installed civicrm 3.0 alpha (revision - 22963) from svn + drupal 6.13
While working on the civievents participants update i got the following error
" Please correct the following errors in the form fields below:

• Please select valid event. "

Here are the steps to reproduce the problem
1. create an Event & add participants to it.
2. From Event dashboard page click on the "Participants" link for that
event (attached screen shot - eventDashboard.png)
3. select one or more events and from "more actions" select any
options & hit "Go". this will give the error (attached screen shot-
eventError.png)

• when i checked the search criteria by clicking on "Edit search"
  link, in "Event Name" field it shows the event id instead of event
  name (attached screen shot - errorDetails.png)

Thanks,
Shashikant.