이클립스 "An error occurred while collecting items to be installed"

이클립스에서 Update를 하는데 이런 에러가 발생하고 있습니다ㅠ

An error occurred while collecting items to be installed

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

No repository found containing: osgi.bundle,org.aspectj.runtime.source,1.7.0.20120507134200

No repository found containing: osgi.bundle,org.eclipse.contribution.weaving.jdt.source,2.2.0.e36x-20120507-1400

No repository found containing: org.eclipse.update.feature,org.eclipse.contribution.weaving.source,2.2.0.e36x-20120507-1400

No repository found containing: osgi.bundle,org.eclipse.contribution.xref.core.source,2.2.0.e36x-20120507-1400

No repository found containing: org.eclipse.update.feature,org.eclipse.contribution.xref.source,2.2.0.e36x-20120507-1400

No repository found containing: osgi.bundle,org.eclipse.contribution.xref.ui.source,2.2.0.e36x-20120507-1400

No repository found containing: osgi.bundle,org.eclipse.net4j.jms.api,3.0.0.v20110215-1551

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이클립스를 아예 종료했다가 다시 시작하거나, 혹은 시간이 좀 지나서 하면 되는 경우도 있더라구요.