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这两个错误提示是什么意思?怎么办?
Plug-in "org.eclipse.rap.ui.views" was unable to instantiate class "org.eclipse.ui.views.contentoutline.ContentOutline".
class org.eclipse.ui.internal.ViewIntroAdapterPart cannot be cast to class org.eclipse.ui.IViewPart (org.eclipse.ui.internal.ViewIntroAdapterPart is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @6b83ec49; org.eclipse.ui.IViewPart is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @c2ceb8d)