React-native 問題彙總

問題一：

Application HelloWorld_o1 has not been registered.

Hint: This error often happens when you're running the packager (local dev server) from a wrong folder. For example you have multiple apps and the packager is still running for the app you were working on before.
If this is the case, simply kill the old packager instance (e.g. close the packager terminal window) and start the packager in the correct app folder (e.g. cd into app folder and run 'npm start').

This error can also happen due to a require() error during initialization or failure to call AppRegistry.registerComponent.

**重點內容**
runApplication
    AppRegistry.js:151:6
__callFunction
    MessageQueue.js:244:47
<unknown>
    MessageQueue.js:108:26
guard
    MessageQueue.js:46:4
callFunctionReturnFlushedQueue
    MessageQueue.js:107:10

這是一個項目在多個終端運行打開了，解決辦法是關閉所有終端重新打開一個終端重新運行該項目