没有“<var>X</var>”的公共默认构造函数。它可能由“<var>X</var>”标记引用，或它可能是属性元素的默认类型。

Message in Chinese (Simplified) (中文(简体))

Unlocalized message

There is no public default constructor for '<var>X</var>'. This might be referenced by a '<var>X</var>' tag, or it might be the default type for a property element.

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