Unable to get document from Amazon S3 using Amazon S3 Download object Integration Service

While trying to fetch document from AWS S3 i am getting error  "This plug-in [com.appiancorp.ps.plugins.amazonS3Utils] is not registered to access secured values for the given external system key [amazon key]. Check the external system’s plug-ins list in the Administration Console. tested the key as a third party credentials and it works fine. Is this appian issue or something wrong with the credentials being passed?

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