Error flushing page

I’m using wicket-1.4.rc4 with Geronimo 2.1.4 (tomcat 6, java ee 5) and have got the following exception: 2009-09-11 10:10:44,212 ERROR [DiskPageStore] Error flushing page java.lang.RuntimeException: java.io.FileNotFoundException:

FeedbackIndicator doesn't work inside RefreshingView

I'm using RefreshingView to show and edit data. I put MinimumValidator to the TextField in RefreshingView (in method populateItem()).Also I put FeedbackIndicator for this TextField in RefreshingView (also in method populateItem()). MinimumValidator works fine - I'm getting error messages at the