Getting Index Error while adding pod

[hj250139]

pod repo-art add Test_SDK https://sample.jfrog.io/ui/native/sample-swift/Sample
Retrieving index from https://sample.jfrog.io/ui/native/sample-swift/Sample into local spec repo Test_SDK
[!] Error getting the index from Artifactory at: 'https://sample.jfrog.io/ui/native/sample-swift/Sample : [!] /usr/bin/tar xf /Users/hj250139/.cocoapods/repos-art/Test_SDK/Specs/file.tgz -C /Users/hj250139/.cocoapods/repos-art/Test_SDK/Specs

tar: Error opening archive: Unrecognized archive format

pod version 1.15.2