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我正在尝试使用 jenkins 插件构建 docker 映像docker-build-step。我只是在尝试创建图像的标准设置：

在此处输入图像描述

但是，当我尝试构建时，我得到了 NullPointerException。起初我认为它与这个问题相同，但后来我仔细观察发现它不是（虽然我不太明白那个问题的答案，所以我没有设法明确排除它不是一个相关的问题）

First time build. Skipping changelog.
ERROR: Build step failed with exception
java.lang.NullPointerException
    at com.github.dockerjava.jaxrs.DockerCmdExecFactoryImpl.init(DockerCmdExecFactoryImpl.java:105)
    at com.github.dockerjava.core.DockerClientImpl.withDockerCmdExecFactory(DockerClientImpl.java:64)
    at com.github.dockerjava.core.DockerClientBuilder.build(DockerClientBuilder.java:63)
    at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.createDockerClient(DockerBuilder.java:132)
    at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.getDockerClient(DockerBuilder.java:204)
    at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder.perform(DockerBuilder.java:68)
    at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
    at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:782)
    at hudson.model.Build$BuildExecution.build(Build.java:205)
    at hudson.model.Build$BuildExecution.doRun(Build.java:162)
    at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:534)
    at hudson.model.Run.execute(Run.java:1738)
    at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
    at hudson.model.ResourceController.execute(ResourceController.java:98)
    at hudson.model.Executor.run(Executor.java:410)
Build step 'Execute Docker command' marked build as failure
Finished: FAILURE

我能做些什么来处理这个异常？

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