Error in block [publication_detail_1] undefined method `expression=' for "[NF: this.speakers]":String
collection_drop.expression = expression
^^^^^^^^^^^^^ /home/app/ems/app/models/block.rb:224:in `prepare_entity_list'
Error in block [agenda_2] undefined method `expression=' for "[NF: this.agenda_entries]":String
collection_drop.expression = expression
^^^^^^^^^^^^^ /home/app/ems/app/models/block.rb:224:in `prepare_entity_list'