今天打开IDEA时，出现了“Unable to save settings Failed to save settings”异常，百度了一下，发现大部分都是说卸载“identifier Highlighter”插件，但是我并没有安装这个插件，所以在翻找了好久之后，终于是解决了问题，在此下一下我的解决经验。
IDEA这个报错翻译过来就是：“保存设置失败”，至于是为什么失败，并没有在此处说明，但是IDEA把具体原因放到了他的日志文件中，所以只要我们找到了日志文件，那么就可以对症下药，解决问题！
1.寻找日志文件
C盘—User(用户)—.IntelliJIdea文件夹—system—log—idea.log
注意：如果电脑有多个用户，那么就是在你当前用户下的.IntelliJIdea文件夹中
2.找到报错
打开idea.log文件，从最下面开始翻，找到最新的报错信息，那就是你遇到的真正问题，找到之后，翻译一下，基本就知道问题在哪儿了
下面列举几个报错的原因
1.这个报错是没有写入文件的权限，再看后面的“C:\Users\.idea”，说明是没有C盘的写入权限
2.此处最下面可以看到“ Cannot save scheme workspace/Jetty Server”，说明是jetty的配置有问题(此处代码转载自https://blog.csdn.net/yjw123456/article/details/78547552/)
2017-11-15 17:20:55,720 [ 196716] WARN - mponents.impl.stores.StoreUtil - Save settings failed java.lang.RuntimeException: java.lang.Exception: Cannot get RunManager component state at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:179) at com.intellij.util.lang.CompoundRuntimeException.throwIfNotEmpty(CompoundRuntimeException.java:148) at com.intellij.configurationStore.ComponentStoreImpl.save(ComponentStoreImpl.kt:199) at com.intellij.openapi.components.impl.stores.StoreUtil.save(StoreUtil.java:49) at com.intellij.openapi.project.impl.ProjectImpl.save(ProjectImpl.java:349) at com.intellij.openapi.components.impl.stores.StoreUtil.saveDocumentsAndProjectsAndApp(StoreUtil.java:126) at com.intellij.openapi.application.impl.ApplicationImpl.saveAll(ApplicationImpl.java:1437) at com.intellij.ide.SaveAndSyncHandlerImpl.saveProjectsAndDocuments(SaveAndSyncHandlerImpl.java:126) at com.intellij.ide.SaveAndSyncHandlerImpl$2.a(SaveAndSyncHandlerImpl.java:94) at com.intellij.openapi.application.TransactionGuardImpl.a(TransactionGuardImpl.java:86) at com.intellij.openapi.application.TransactionGuardImpl.a(TransactionGuardImpl.java:109) at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:118) at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:122) at com.intellij.ide.SaveAndSyncHandlerImpl$2.onFrameDeactivated(SaveAndSyncHandlerImpl.java:92) at com.intellij.ide.FrameStateManagerImpl.a(FrameStateManagerImpl.java:84) at com.intellij.ide.FrameStateManagerImpl.access$500(FrameStateManagerImpl.java:32) at com.intellij.ide.FrameStateManagerImpl$2.a(FrameStateManagerImpl.java:70) at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:246) at com.intellij.util.Alarm$Request.runSafely(Alarm.java:417) at com.intellij.util.Alarm$Request.access$700(Alarm.java:344) at com.intellij.util.Alarm$Request$1.run(Alarm.java:384) at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:314) at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.a(LaterInvocator.java:416) at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:399) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762) at java.awt.EventQueue.access$500(EventQueue.java:98) at java.awt.EventQueue$3.run(EventQueue.java:715) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:732) at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:821) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:649) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:365) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) Caused by: java.lang.Exception: Cannot get RunManager component state at com.intellij.configurationStore.ComponentStoreImpl.save(ComponentStoreImpl.kt:166) ... 38 more Caused by: java.lang.RuntimeException: Cannot save scheme workspace/Jetty Server: jetty (level: WORKSPACE) at com.intellij.configurationStore.SchemeManagerImpl.save(SchemeManagerImpl.kt:535) at com.intellij.configurationStore.Scheme_implKt.save(scheme-impl.kt:154) at com.intellij.execution.impl.RunManagerImpl.getState(RunManagerImpl.kt:500) at com.intellij.execution.impl.RunManagerImpl.getState(RunManagerImpl.kt:63) at com.intellij.configurationStore.ComponentStoreImpl.a(ComponentStoreImpl.kt:227) at com.intellij.configurationStore.ComponentStoreImpl.save(ComponentStoreImpl.kt:159) ... 38 more
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