The helm plugin is platform sensitive. The helm plugin which build on Ubuntu cannot be loaded to centos Cloudify manager.

Here is the Wagon archive of helm plugin

$ wagon show onap_helm_plugin-2.3.0-py27-none-linux_x86_64.wgn

{

    "archive_name": "onap_helm_plugin-2.3.0-py27-none-linux_x86_64.wgn",

    "build_server_os_properties":

{         "distribution": "centos",         "distribution_release": "core",         "distribution_version": "7.5.1804"     }

,

    "created_by_wagon_version": "0.7.0",

    "package_name": "onap-helm-plugin",

    "package_source": "helm-plugin.tar.gz",

    "package_version": "2.3.0",

    "supported_platform": "linux_x86_64",

    "supported_python_versions": [

        "py27"

    ],

    "wheels": [

        "requests-2.19.1-py2.py3-none-any.whl",

        "requests_toolbelt-0.8.0-py2.py3-none-any.whl",

        "urllib3-1.23-py2.py3-none-any.whl",

        "idna-2.7-py2.py3-none-any.whl",

        "certifi-2018.4.16-py2.py3-none-any.whl",

        "chardet-3.0.4-py2.py3-none-any.whl",

        "cloudify_plugins_common-3.4.2-py2-none-any.whl",

        "onap_helm_plugin-2.3.0-py2-none-any.whl",

        "PyYAML-3.13-cp27-cp27mu-linux_x86_64.whl",

        "cloudify_rest_client-3.4.2-py2-none-any.whl",

        "pika-0.9.14-py2-none-any.whl",

        "networkx-1.8.1-py2-none-any.whl",

        "proxy_tools-0.1.0-py2-none-any.whl",

        "bottle-0.12.7-py2-none-any.whl",

        "Jinja2-2.7.2-py2-none-any.whl",

        "MarkupSafe-1.0-py2-none-any.whl"

    ]

}