Fatal error after puli publish /myapp/public myserver

[niklongstone]

From a clean directory just with the Puli CLI, If I require in composer only the puli/composer-plugin and I run CLI command to publish web server resources a fatal error appears:
fatal: The type "puli/public-resource" does not exist.

The error is solved just installing the puli/url-generator package.
Below step to reproduce the issue:

puli.phar server --add myserver public_htm
puli.phar server --add myserver public_htm
puli.phar publish /myapp/public myserver

 fatal: The type "puli/public-resource" does not exist.

the solution is just run a composer.json like:

{
"minimum-stability":"beta",
    "require": {
        "puli/url-generator": "^1.0",
        "puli/composer-plugin": "^1.0@beta"
    }
}

Maybe the error doesn't reflect the real issue.