Unable to swap Environment URL's on Elastic Beanstalk

Question

I am trying to do Blue Green Deployment on AWS Elastic Bean Stalk. I have two environments v_0 and v_1. I am able to access my website from the environment URL's. When I go to Actions-> swap URL from the new environment , it gives an error message: You need at least two web tier environments in the Ready state to complete this operation.

Answer

I have also faced same problem. Can't find related details or resolution till now. Surprisingly other threads on web don't have much details on it.   
@pava, I believe it you resolved it. Can you let me know? Thanks!

Answer

Hello,  
  
Please ref: https://forums.aws.amazon.com/thread.jspa?messageID=944117&#944117

Answer

I am having the same issue, did you find a solution or cause?

Unable to swap Environment URL's on Elastic Beanstalk

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