Unexpected Error

The system encountered an error while processing the following request:
/npm/search/results.displaypanel.displaycell.detailclick/46/ent:$002f$002fSD_ILS$002f0$002fSD_ILS:217842/10/10

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.
Mon Dec 09 20:39:47 CST 2019