[ERROR] Failed to execute goal com.github.github:site-maven-plugin:0.12:site (default) on project parent: Error retrieving user info: Not Found (404) -> [Help 1]

What is meaning of Error retrieving user info: Not Found (404) ?

why and what is missing for Nodeclipse https://github.com/Nodeclipse/nodeclipse-1/issues/195, while it works for eExplorer https://github.com/culmat/eExplorer/pull/42#issuecomment-142073479?

Code at https://github.com/Nodeclipse/nodeclipse-1/blob/master/pom.xml#L244-L264

            <plugin>
                <groupId>com.github.github</groupId>
                <artifactId>site-maven-plugin</artifactId>
                <version>0.12</version>
                <configuration>
                    <repositoryOwner>Nodeclipse</repositoryOwner>
                    <repositoryName>nodeclipse-1</repositoryName>
                    <message>Puplishing site for ${project.version}</message>
                    <path>site</path>
                    <oauth2Token>${env.github_oauth2Token}</oauth2Token>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>site</goal>
                        </goals>
                        <phase>site</phase>
                    </execution>
                </executions>
            </plugin>

github / maven-plugins

[ERROR] Failed to execute goal com.github.github:site-maven-plugin:0.12:site (default) on project parent: Error retrieving user info: Not Found (404) -> [Help 1] #100