Базой надстройки являлся один интерфейс, но в качестве допустимых баз надстройки помечено несколько интерфейсов. Надстройка <var>X</var> в <var>Y</var>

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An add-in's base was an interface, but there were multiple interfaces marked as being valid add-in bases. Add-in <var>X</var> in <var>Y</var>

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