An Exception about <SolutionRepositoryVfs cannot be cast to AbstractFileProvider>

[Yami4ever]

Hi guys, when I installed a plugin (Simplified Chinese Language Pack Installer) from marketplace,
the pentaho-server throwed an exception:

org.pentaho.platform.repository.solution.filebased.SolutionRepositoryVfs cannot be cast to org.apache.commons.vfs2.provider.AbstractFileProvider
	at org.apache.commons.vfs2.impl.DefaultFileSystemManager.freeUnusedResources(DefaultFileSystemManager.java:586)
	at org.pentaho.di.core.vfs.ConcurrentFileSystemManager.freeUnusedResources(ConcurrentFileSystemManager.java:171)
	at org.pentaho.di.core.vfs.KettleVFS.freeUnusedResources(KettleVFS.java:522)
	at org.pentaho.di.job.Job.run(Job.java:465)

8.1.0.0-SNAPSHOT
Up to now - commit f6d126a.

好吧，我的英文一般般，希望你们明白。