Getting error when i build using pipline

[Arunchinnapparaj]

Error:

Uploading ...fatal: Could not upload files., exiting... 

bitbucket-pipelines.yml

image: samueldebruyn/debian-git         

pipelines:
  default:
    - step:
        script:
          - apt-get update
          - apt-get -qq install git-ftp
          - git ftp init --user $FTP_USERNAME --passwd $FTP_PASSWORD ftp://<server path>