Unexpected Error

The system encountered an error while processing the following request:
/en_AU/all/search/results.displaypanel.displaycell.detailclick/3/ent:$002f$002fARCHIVES_DIGITISED$002f0$002fNS2340-1-4/3/3

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 190]. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled.
Tue Jan 23 22:49:15 EST 2018