关于idea开发工具突然打不开项目的问题

Question

在一个半小时前，我离开电脑时项目还在运行中，没有任何错误，一切正常，回来之后发现idea报错，我重启idea发现变成了上图所示，打开所有项目都是这样

Answer 1

运行报以下错误：
Error:Internal error: (java.lang.ClassFormatError) Illegal UTF8 string in constant pool in class file org/jetbrains/jps/gwt/model/impl/JpsGwtModelSerializerExtension
java.lang.ClassFormatError: Illegal UTF8 string in constant pool in class file org/jetbrains/jps/gwt/model/impl/JpsGwtModelSerializerExtension
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:363)
at java.util.ServiceLoader$1.next(ServiceLoader.java:445)
at com.intellij.util.containers.ContainerUtilRt.copy(ContainerUtilRt.java:179)
at com.intellij.util.containers.ContainerUtilRt.newArrayList(ContainerUtilRt.java:168)
at org.jetbrains.jps.plugin.impl.JpsPluginManagerImpl.loadExtensions(JpsPluginManagerImpl.java:18)
at org.jetbrains.jps.service.impl.JpsServiceManagerImpl.getExtensions(JpsServiceManagerImpl.java:59)
at org.jetbrains.jps.model.serialization.JpsModelSerializerExtension.getExtensions(JpsModelSerializerExtension.java:46)
at org.jetbrains.jps.model.serialization.library.JpsSdkTableSerializer.getSdkPropertiesSerializer(JpsSdkTableSerializer.java:205)
at org.jetbrains.jps.model.serialization.library.JpsSdkTableSerializer.loadSdk(JpsSdkTableSerializer.java:99)
at org.jetbrains.jps.model.serialization.library.JpsSdkTableSerializer.loadSdks(JpsSdkTableSerializer.java:80)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader$SdkTableSerializer.loadExtension(JpsGlobalLoader.java:144)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader$SdkTableSerializer.loadExtension(JpsGlobalLoader.java:137)
at org.jetbrains.jps.model.serialization.JpsLoaderBase.loadComponents(JpsLoaderBase.java:61)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader.loadGlobalComponents(JpsGlobalLoader.java:83)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader.load(JpsGlobalLoader.java:73)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader.loadGlobalSettings(JpsGlobalLoader.java:59)
at org.jetbrains.jps.model.serialization.impl.JpsSerializationManagerImpl.loadModel(JpsSerializationManagerImpl.java:38)
at org.jetbrains.jps.cmdline.JpsModelLoaderImpl.loadModel(JpsModelLoaderImpl.java:45)
at org.jetbrains.jps.cmdline.BuildRunner.load(BuildRunner.java:78)
at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:266)
at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:125)
at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler$1.run(BuildMain.java:232)
at org.jetbrains.jps.service.impl.SharedThreadPoolImpl$1.run(SharedThreadPoolImpl.java:42)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)