Problem converting proposal to code actions

Problem converting proposal to code actions src/main/java/com/example/myflutterapp1 [in app] is not on its project's build path Java Model Exception: Java Model Status [src/main/java/com/example/myflutterapp1 [in app] is not on its project's build path] at org.eclipse.jdt.internal.core.PackageFragmentRoot.getResolvedClasspathEntry(PackageFragmentRoot.java:616) at org.eclipse.jdt.core.manipulation.OrganizeImportsOperation$TypeReferenceProcessor.process(OrganizeImportsOperation.java:358) at org.eclipse.jdt.core.manipulation.OrganizeImportsOperation.createTextEdit(OrganizeImportsOperation.java:597) at org.eclipse.jdt.ls.core.internal.text.correction.SourceAssistProcessor$1.addEdits(SourceAssistProcessor.java:52) at org.eclipse.jdt.ls.core.internal.corrections.proposals.CUCorrectionProposal.createTextChange(CUCorrectionProposal.java:138) at org.eclipse.jdt.ls.core.internal.corrections.proposals.CUCorrectionProposal.createChange(CUCorrectionProposal.java:145) at org.eclipse.jdt.ls.core.internal.corrections.proposals.ChangeCorrectionProposal.getChange(ChangeCorrectionProposal.java:154) at org.eclipse.jdt.ls.core.internal.handlers.CodeActionHandler.getCodeActionFromProposal(CodeActionHandler.java:130) at org.eclipse.jdt.ls.core.internal.handlers.CodeActionHandler.getCodeActionCommands(CodeActionHandler.java:118) at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$14(JDTLanguageServer.java:588) at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$26(JDTLanguageServer.java:793) at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:642) at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:479) at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290) at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1603) at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)