An error occurred while collecting items to be installed

session context was:(profile=DefaultProfile, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).

Problems downloading artifact: osgi.bundle,org.eclipse.team.svn.core,2.0.4.I20150123-1700.

MD5 hash is not as expected. Expected: b69ac03f4361de6a4127f9ee666d6f9d and found 3974079e734a0e8f50845bbca5ee1adf.

Problems downloading artifact: osgi.bundle,org.eclipse.team.svn.ui,2.0.3.I20141224-1700.

安装的时候出现这个错误，怎么回事？