ok. Let's first be sure that your conf file is correct.

aws {
s3 {
key: "david"
secret: "supersecret"
use_credentials_chain: false

        credentials: [
            {
                 # This will apply to all buckets in this host (unless key/value is specifically provided for a given bucket)
                 host: "localhost:9000"
                 key: "david"
                 secret: "supersecret"
                 multipart: false
                 secure: false
             }