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iosamazon-web-servicesamazon-lex

iOS connection to Lex Runtime error Code=4 "null"

My iOS app could connect to Lex Runtime with no issues - but now it can't and gets this error:

Error Domain=com.amazonaws.AWSLexErrorDomain Code=4 "null" UserInfo={NSLocalizedDescription=null, NSLocalizedFailureReason=DependencyFailedException:http://internal.amazon.com/coral/

I have an Cognito federated ID, which has the Lex policies attached. I'm assuming it's a permissions based issue but unsure what has changed to cause it.

Solution

  • I've resolved it - the error was not with permissions but with the underlying Lambda function which is connected to the Lex bot. The Lambda instance had a coding error which caused the issue; looking through the Lambda Cloudwatch logs showed the error.