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以下错误是什么意思？

Error: package or namespace load failed for ‘FSelector’:
 .onLoad failed in loadNamespace() for 'RWeka', details:
  call: new_Weka_package_manager()
  error: java.lang.UnsupportedClassVersionError: weka/core/WekaPackageManager : Unsupported major.minor version 52.0
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