Unexpected Error

The system encountered an error while processing the following request:
/en_AU/default/search/results.displaypanel.displaycell.detailclick/3/ent:$002f$002fSD_ASSET$002f0$002f9/3/3

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.
Thu Dec 12 19:09:17 EST 2019