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我一直在研究 node-opcua 书中的示例，这本书非常有帮助（完成后会很棒！！！！）。但是，当服务器发布事件时，我在使用 Prosys 和 Matrikon 客户端时遇到了问题。具体来说，服务器崩溃：

Users/brbl/Projects/GitHub/opcua-tutorial/node_modules/node-opcua-address-space/src/alarms_and_conditions/check_where_clause.ts:120
    }
     ^
Error: Only OfType operator are allowed in checkWhereClause
    at Object.checkWhereClause (/Users/brbl/Projects/GitHub/opcua-tutorial/node_modules/node-opcua-address-space/src/alarms_and_conditions/check_where_clause.ts:120:6)
    at MonitoredItem._on_opcua_event (/Users/brbl/Projects/GitHub/opcua-tutorial/node_modules/node-opcua-server/source/monitored_item.ts:833:10)
    at UAObject.emit (events.js:214:15)
    at UAObject.EventEmitter.emit (domain.js:476:20)
    at UAObject._bubble_up_event (/Users/brbl/Projects/GitHub/opcua-tutorial/node_modules/node-opcua-address-space/src/ua_object.ts:161:20)
    at UAObject.raiseEvent (/Users/brbl/Projects/GitHub/opcua-tutorial/node_modules/node-opcua-address-space/src/ua_object.ts:144:14)
    at Timeout._onTimeout (/Users/brbl/Projects/GitHub/opcua-tutorial/my_event_server.ts:95:11)
    at listOnTimeout (internal/timers.js:531:17)
    at processTimers (internal/timers.js:475:7)

任何有关如何解决问题的指导将不胜感激。谢谢。

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