Circle CI - Swift Pod install returning error

I am using Circle CI in my Swift Project, it was working fine until today. I tried my best to solve this issue but couldn't. I am getting this error about Pods and have no idea why.

[!] Oh no, an error occurred.

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 - Pod install returning error [closed] [3 comments]
   15 Dec 2014

Exited with code 1
CircleCI received exit code 1

I already dig into the issues mentioned here but unable to solved it. Thanks in advance.