See HUDSON-8718 for the original issue before the move to Jenkins.

In the CIFS-Publisher project settings, when the destination is left blank, the system reports a strange error:
ERROR: Failed to upload files
java.lang.NullPointerException
at com.slide.hudson.plugins.CIFSPublisher.perform(CIFSPublisher.java:167)
at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:622)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:601)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:579)
at hudson.model.Build$RunnerImpl.post2(Build.java:156)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:548)
at hudson.model.Run.run(Run.java:1386)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:145)
Finished: UNSTABLE

I would expect a more descriptive error message and a blank field to signify the root of the share (preferred option).

Workaround: if the intention was to put the file at the root of the share, enter "." for the destination folder.