Can not set classpath of the project "Failed to update classpaths: Error: Cannot invoke "org.eclipse.jdt.core.IClasspathEntry.getPath()" because "rawClasspath[i]" is null"

[XiaoHuang]

Created a very simple hello world java project. Followed every step in the README, but the java files are not recognized with the error
"xxx.java is not on the classpath of project java, only syntax errors are reported"

I then try to add the classpath manually with "Java:Configure Classpath", and I got this error message

[Error - 10:49:20 PM] Oct 20, 2024, 10:49:20 PM src [in java] does not exist src [in java] does not exist Java Model Exception: Error in Java Model (code 969): src [in java] does not exist at org.eclipse.jdt.internal.core.JavaElement.newNotPresentException(JavaElement.java:562) at org.eclipse.jdt.internal.core.PackageFragmentRoot.getUnderlyingResource(PackageFragmentRoot.java:762) at org.eclipse.jdt.internal.core.PackageFragment.getUnderlyingResource(PackageFragment.java:430) at org.eclipse.jdt.internal.core.Openable.getUnderlyingResource(Openable.java:329) at org.eclipse.jdt.internal.core.CompilationUnit.getUnderlyingResource(CompilationUnit.java:967) at org.eclipse.jdt.ls.core.internal.handlers.BaseDiagnosticsHandler.collectNonJavaProblems(BaseDiagnosticsHandler.java:191) at org.eclipse.jdt.ls.core.internal.handlers.BaseDiagnosticsHandler.endReporting(BaseDiagnosticsHandler.java:142) at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.reportProblems(ReconcileWorkingCopyOperation.java:141) at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.executeOperation(ReconcileWorkingCopyOperation.java:110) at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:739) at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:804) at org.eclipse.jdt.internal.core.CompilationUnit.reconcile(CompilationUnit.java:1303) at org.eclipse.jdt.ls.core.internal.handlers.BaseDocumentLifeCycleHandler.publishDiagnostics(BaseDocumentLifeCycleHandler.java:332) at org.eclipse.jdt.ls.core.internal.handlers.BaseDocumentLifeCycleHandler.publishDiagnostics(BaseDocumentLifeCycleHandler.java:295) at org.eclipse.jdt.ls.core.internal.handlers.BaseDocumentLifeCycleHandler$PublishDiagnosticJob.run(BaseDocumentLifeCycleHandler.java:777) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

Any help would be grateful. Thanks in advance!

[guw]

Can you share the simple project?