Cannot run configured Task with Label

[tsmaeder]

1. Configure a npm build task with a label like so:

"tasks": [
        {
            "label": "npmbuild",
            "type": "npm",
            "script": "build",
            "group": "build",
            "problemMatcher": []
         }
    ]

2. Execute the command Run Task...
3. Observe: you see a task labeled npm: npmbuild
4. Select that task to run.
5. Observe: you get an error:

task ERROR Can't get task launch configuration for label: npmbuild

When you remove the field label from the configuration above, you can execute the task under the name npm: build.