java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at io.vertx.core.http.impl.HttpServerResponseImpl.doSendFile(HttpServerResponseImpl.java:491)
at io.vertx.core.http.impl.HttpServerResponseImpl.sendFile(HttpServerResponseImpl.java:342)
at io.vertx.core.http.HttpServerResponse.sendFile(HttpServerResponse.java:317)
at io.vertx.core.http.HttpServerResponse.sendFile(HttpServerResponse.java:303)
at io.vertx.ext.web.handler.impl.StaticHandlerImpl.lambda$sendFile$6(StaticHandlerImpl.java:386)
at io.vertx.ext.web.handler.impl.StaticHandlerImpl.wrapInTCCLSwitch(StaticHandlerImpl.java:229)
at io.vertx.ext.web.handler.impl.StaticHandlerImpl.sendFile(StaticHandlerImpl.java:375)
at io.vertx.ext.web.handler.impl.StaticHandlerImpl.lambda$sendStatic$0(StaticHandlerImpl.java:192)
at io.vertx.ext.web.handler.impl.StaticHandlerImpl.getFileProps(StaticHandlerImpl.java:275)
at io.vertx.ext.web.handler.impl.StaticHandlerImpl.sendStatic(StaticHandlerImpl.java:182)
at io.vertx.ext.web.handler.impl.StaticHandlerImpl.handle(StaticHandlerImpl.java:143)
at io.vertx.ext.web.handler.impl.StaticHandlerImpl.handle(StaticHandlerImpl.java:52)
at vip.vertx.app.SampleBlockingVerticle.lambda$0(SampleBlockingVerticle.java:22)
at io.vertx.ext.web.impl.BlockingHandlerDecorator.lambda$handle$0(BlockingHandlerDecorator.java:48)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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