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java.lang.NullPointerException: null	at org.springframework.cloud.sleuth.instrument.web.client.feign.TraceFeignRetryer.continueOrPropagate(TraceFeignRetryer.java:56)	at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:78)	at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103)	at com.sun.proxy.$Proxy100.exp(Unknown Source)	at net.test.sleuth.controllers.SleuthTestController.notOk(SleuthTestController.java:26)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)