SpringToolSuite4 建立boot项目yml文件 没有提示

SpringToolSuite4 建立boot项目yml文件 alt+/ 提示 org.eclipse.lsp4j.jsonrpc.ResponseErrorException: Internal error.

在error log中报错信息如下
java.util.concurrent.ExecutionException: org.eclipse.lsp4j.jsonrpc.ResponseErrorException: Internal error.
at java.util.concurrent.CompletableFuture.reportGet(Unknown Source)
at java.util.concurrent.CompletableFuture.get(Unknown Source)
at org.eclipse.lsp4e.operations.completion.LSContentAssistProcessor.computeCompletionProposals(LSContentAssistProcessor.java:96)
at org.eclipse.jface.text.contentassist.AsyncCompletionProposalPopup$2.run(AsyncCompletionProposalPopup.java:352)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.jface.text.contentassist.AsyncCompletionProposalPopup.lambda$8(AsyncCompletionProposalPopup.java:349)
at java.util.concurrent.CompletableFuture$AsyncSupply.run(Unknown Source)
at java.util.concurrent.CompletableFuture$AsyncSupply.exec(Unknown Source)
at java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(Unknown Source)
at java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
at java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)
Caused by: org.eclipse.lsp4j.jsonrpc.ResponseErrorException: Internal error.
at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.handleResponse(RemoteEndpoint.java:209)
at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.consume(RemoteEndpoint.java:193)
at org.eclipse.lsp4e.LanguageServerWrapper.lambda$1(LanguageServerWrapper.java:214)
at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.handleMessage(StreamMessageProducer.java:194)
at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:94)
at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:113)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)