Unexpected Error

The system encountered an error while processing the following request:
/default/search/results.displaypanel.displaycell.detailclick/0/ent:$002f$002fSD_ILS$002f689$002fSD_ILS:689783/0/0

Error Summary

A component event handler method returned the value Block[Body of search/Results:displaypanel.displaycell.twilightzone, at classpath:com/sirsidynix/discovery/client/components/search/SearchDisplayCell.tml, line 188]. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled.
Sat Sep 23 15:33:07 MDT 2017