刚刚安装了Eclipse，当我启动它时，它会询问保存工作区的位置。我按好了，它说发生了错误并检查了.log。这是.log的开始。我尝试-clean但它没有用。什么都行不通。我该怎么办？
!SESSION 2014-09-03 18:51:04.824 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.8.0_20
java.vendor=Oracle Corporation
BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_US
Framework arguments: -product org.eclipse.epp.package.standard.product -keyring /Users/Coding/.eclipse_keyring -showlocation
Command-line arguments: -os macosx -ws cocoa -arch x86_64 -product org.eclipse.epp.package.standard.product -keyring /Users/Coding/.eclipse_keyring -showlocation
!ENTRY org.eclipse.epp.mpc.ui 4 0 2014-09-03 18:51:06.989
!MESSAGE FrameworkEvent ERROR
!STACK 0
org.osgi.framework.BundleException: Could not resolve module: org.eclipse.epp.mpc.ui [157]
Unresolved requirement: Require-Bundle: org.eclipse.equinox.p2.ui.discovery; bundle-version="[1.0.0,1.1.0)"
-> Bundle-SymbolicName: org.eclipse.equinox.p2.ui.discovery; bundle-version="1.0.100.v20131210-1027"; singleton:="true"
org.eclipse.equinox.p2.ui.discovery [231]
Unresolved requirement: Require-Bundle: org.eclipse.equinox.p2.ui; bundle-version="2.0.0"
-> Bundle-SymbolicName: org.eclipse.equinox.p2.ui; bundle-version="2.3.0.v20140404-1657"; singleton:="true"
org.eclipse.equinox.p2.ui [239]
Unresolved requirement: Import-Package: org.eclipse.equinox.internal.p2.artifact.repository
at org.eclipse.osgi.container.Module.start(Module.java:434)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1582)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1561)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:1533)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1476)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)