Explanation:
The PlayerStatsExpansion gets its information from PlayerStats, but PlayerStats only comes with an API from version 1.7 onwards. So, if you try to use the expansion with an older version of PlayerStats, it tries to use methods that PlayerStats does not (yet) have - or, more specifically, it tries to use classes from PlayerStats that do not yet exist in this version.
说明:
PlayerStatsExpansion从PlayerStats获取信息,但PlayerStats仅从1.7版开始提供API。因此,如果您尝试在旧版本的PlayerStats中使用扩展,它会尝试使用PlayerStats(尚未)拥有的方法-或者更具体地说,它会尝试使用PlayerStats中尚未存在的类。