What is the "No Walkscore license key!" message?

The "Walkscore" feature is included in WPL PRO. If you would like to use this feature, you should enable its activity and place it in the correct position. You also need to set a valid Walkscore license key for using this feature. You should get a license key from the Walkscore website.

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If you do not need this feature, you can simply disable its activity using WPL->Activity manager.