[xxx] is not registered in js

[ICECHN]

hippy v3.3
app运行过程中，加载新页面出现报错（非必现），日志如下

07-09 17:37:47.164 3269 10256 E HippyTimeMonitor: engine id 5, group initEngine, totalTime 26ms
07-09 17:37:47.164 3269 10256 E HippyTimeMonitor: initNativeEngine: 19ms
07-09 17:37:47.164 3269 10256 E HippyTimeMonitor: loadVendorJs: 7ms
07-09 17:37:47.166 3269 10256 E HippyTimeMonitor: engine id 5, group runBundle, totalTime 2ms
07-09 17:37:47.166 3269 10256 E HippyTimeMonitor: loadMainJs: 2ms
07-09 17:37:47.168 3269 10255 E reportException: !!!!!!!!!!!!!!!!!!!
07-09 17:37:47.169 3269 10255 E reportException: Event.js: 27: 4-5: Uncaught Error: load instance error: [Demo] is not registered in js
07-09 17:37:47.169 3269 10255 E reportException: Event.js:27:11:global.loadInstance

帮忙看下什么原因？有什么优化方案？