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I'm learning AWS Lex through its [documentation](https://docs.aws.amazon.com/lexv2/latest/dg/exercise-1.html) But in the testing step, it doesn't work, it shows a message like this. Please help to know how to solve that issue. Thanks!


![Enter image description here](/media/postImages/original/IMICS3RZSnQymOkjbT3N3egQ)

AWS lex chatbox doesn't work. it throw "Network Failure"  error message

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AWS lex chatbox doesn't work. it throw "Network Failure" error message

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