WriteableResourcesProxyTest.runWriteableResourcesTest test failure

java.lang.AssertionError: POST request to http://localhost:35847/system/sling/junit/org.apache.sling.launchpad.testservices.serversidetests.WriteableResourcesTest.json: expecting status 200 expected:<200> but was:<404>
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.failNotEquals(Assert.java:743)
	at org.junit.Assert.assertEquals(Assert.java:118)
	at org.junit.Assert.assertEquals(Assert.java:555)
	at org.apache.sling.testing.tools.http.RequestExecutor.assertStatus(RequestExecutor.java:155)
	at org.apache.sling.junit.remote.httpclient.RemoteTestHttpClient.runTests(RemoteTestHttpClient.java:134)
	at org.apache.sling.launchpad.webapp.integrationtest.util.ServerSideTestClient.runTests(ServerSideTestClient.java:76)
	at org.apache.sling.launchpad.webapp.integrationtest.util.ServerSideTestClient.assertTestsPass(ServerSideTestClient.java:100)
	at org.apache.sling.launchpad.webapp.integrationtest.WriteableResourcesProxyTest.runWriteableResourcesTest(WriteableResourcesProxyTest.java:26)