Cannot Start Build. Unlicensed Plugins?

[Wm. Dexter Jones]

I am at the build phase and the button is disabled with the following message:

The project contains unlicensed plugins.

as far as i know, all of the plugins were all open source. how can i determine which plugin(s) are unlicensed?

Any assistance is appreciated. Thanks.

[khemry]

@wm-dexter-jones I assume you are a free user.
​Free users can only build a project with core Cordova plugins. ​External or third-party plugins can’t be used.

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[Danielle]

Hello. What’s the meaning of this? So we can’t build our app? I don’t remember that I added plugin. The error keeps prompting.