在尝试将 CVS 客户端安装到我不再加载的 Eclipse/STS（版本 4.7.1）中之后。我已经重新安装了几次 Eclipse/STS，但启动问题仍然存在……我得到了下面列出的例外情况。从工作区中删除 .metadata/ 文件夹后，在间歇性尝试中，它有时会加载。但是一旦我关闭它并尝试重新打开它，它就再也不会在那个工作区上启动了。
我从其他（较旧的）堆栈溢出帖子中尝试过的事情：
- 重新安装 STS，几次...... CVS 客户端“应该”不再是问题......它甚至没有安装在重新安装的版本上。
- 删除 workspace.xmi 文件。
似乎没有任何效果......并且从下面的堆栈跟踪中，我无法判断 NullPointerException 指的是什么。我确实验证了指示的位置中有一个 LegacyIDE.e4xmi 文件，并且我对它具有 R/W 权限。
这是我看到的 .log 中的错误。
!SESSION 2020-09-29 13:03:57.621 -----------------------------------------------
eclipse.buildId=4.7.1.202007271558-RELEASE
java.version=1.8.0_261
java.vendor=Oracle Corporation
BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_US
Framework arguments: -product org.springframework.boot.ide.branding.sts4 -keyring /Users/n0002501/.eclipse_keyring
Command-line arguments: -os macosx -ws cocoa -arch x86_64 -product org.springframework.boot.ide.branding.sts4 -keyring /Users/[myuser]/.eclipse_keyring
!ENTRY org.eclipse.e4.ui.workbench 4 0 2020-09-29 13:04:13.603
!MESSAGE Unable to load resource platform:/plugin/org.eclipse.platform/LegacyIDE.e4xmi
!STACK 0
java.lang.NullPointerException
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.getResource(ResourceHandler.java:287)
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.loadResource(ResourceHandler.java:263)
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.loadMostRecentModel(ResourceHandler.java:181)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.loadApplicationModel(E4Application.java:384)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createE4Workbench(E4Application.java:260)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:579)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
at org.eclipse.equinox.launcher.Main.run(Main.java:1447)
!ENTRY org.eclipse.osgi 4 0 2020-09-29 13:04:13.630
!MESSAGE Application error
!STACK 1
java.lang.NullPointerException
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.loadMostRecentModel(ResourceHandler.java:182)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.loadApplicationModel(E4Application.java:384)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createE4Workbench(E4Application.java:260)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:579)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
at org.eclipse.equinox.launcher.Main.run(Main.java:1447)