ERROR: Build step failed with exception
java.lang.NullPointerException: uri was not specified
	at java.base/java.util.Objects.requireNonNull(Objects.java:246)
	at com.github.dockerjava.core.DefaultDockerClientConfig$Builder.withDockerHost(DefaultDockerClientConfig.java:365)
	at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.createDockerClient(DockerBuilder.java:133)
	at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.getDockerClient(DockerBuilder.java:235)
	at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.getDockerClient(DockerBuilder.java:227)
	at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder.perform(DockerBuilder.java:73)
	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:818)
	at hudson.model.Build$BuildExecution.build(Build.java:199)
	at hudson.model.Build$BuildExecution.doRun(Build.java:164)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:526)
	at hudson.model.Run.execute(Run.java:1900)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:44)
	at hudson.model.ResourceController.execute(ResourceController.java:101)
	at hudson.model.Executor.run(Executor.java:442)
Build step 'Execute Docker command' marked build as failure
Finished: FAILURE