Version 2.1.0 has noted "Vaadin platform **14+**" as Framework Support, but

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[fixed]
Version 2.1.0 has noted “Vaadin platform 14+” as Framework Support, but it should be “18+”. Please change the specification of the note, if this was unintended. The Version 2.1.0 throws a NoSuchMethodException on instantiation in Vaadin 14.7.1

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Good catch. Version 2.1.0 is for Vaadin 18+ and Version 1.2.0 provides the same feature set for Vaadin 14.