java.lang.NullPointerException: This exception has no message.

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at hudson.Launcher$ProcStarter.envs(
at com.cloudbees.jenkins.plugins.customtools.CustomToolInstallWrapper$2.launch(
at hudson.Launcher$ProcStarter.start(
at com.netceler.ivpower.integrationtest.utils.CommandLauncher.launchCommand(
at com.netceler.ivpower.integrationtest.install.InstallerLauncher.launchInstaller(
at com.netceler.ivpower.integrationtest.install.InstallBuildWrapper.setUp(
at hudson.model.Build$BuildExecution.doRun(
at hudson.model.AbstractBuild$
at hudson.model.Run.execute(
at hudson.model.ResourceController.execute(

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