title: Spring Boot Admin error from Client side in port
body: <p>everyone!</p>
  <p>I have a problem with Spring Boot Admin in Client side:</p>
  <pre><code>01-04-2021 23:02:37 [registrationTask1] ERROR o.s.s.s.TaskUtils$LoggingErrorHandler - Unexpected error occurred in scheduled task
  java.lang.NoSuchMethodError: org.springframework.boot.actuate.autoconfigure.web.server.ManagementServerProperties.getBasePath()Ljava/lang/String;
      at de.codecentric.boot.admin.client.registration.ServletApplicationFactory.getManagementContextPath(ServletApplicationFactory.java:86)
      at de.codecentric.boot.admin.client.registration.ServletApplicationFactory.getManagementBaseUrl(ServletApplicationFactory.java:77)
      at de.codecentric.boot.admin.client.registration.DefaultApplicationFactory.getHealthUrl(DefaultApplicationFactory.java:154)
      at de.codecentric.boot.admin.client.registration.DefaultApplicationFactory.createApplication(DefaultApplicationFactory.java:80)
      at de.codecentric.boot.admin.client.registration.DefaultApplicationRegistrator.register(DefaultApplicationRegistrator.java:56)
      at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
      at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
      at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
      at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
      at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
      at java.lang.Thread.run(Thread.java:748)
  </code></pre>
  <p>my pom.xml:</p>
  <pre class="lang-xml prettyprint-override"><code>&lt;dependency&gt;
      &lt;groupId&gt;de.codecentric&lt;/groupId&gt;
      &lt;artifactId&gt;spring-boot-admin-starter-client&lt;/artifactId&gt;
      &lt;version&gt;2.4.0&lt;/version&gt;
  &lt;/dependency&gt;
  &lt;dependency&gt;
      &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
      &lt;artifactId&gt;spring-boot-starter-actuator&lt;/artifactId&gt;
      &lt;version&gt;2.4.0&lt;/version&gt;
  &lt;/dependency&gt;
  </code></pre>
  <p>my application.yaml:</p>
  <pre class="lang-yaml prettyprint-override"><code>spring.boot.admin:
    client:
      url: http://localhost:8080
      username: admin
      password: admin
      instance:
        metadata:
          user:
            name: ${spring.security.user.name}
            password: ${spring.security.user.password}
  ---
  management:
    endpoints:
      web:
        exposure:
          include: httptrace,loggers,health,info,metrics
  </code></pre>
  <p>Admin-side works perfect. Client-side, when I write &quot;url: http://localhost:8080&quot; has error.</p>
  <p>Does anybody know why?</p>