When trying to import a "remote" project in Eclipse on Windows, the following error occurs:

'Project serialization job' has encountered a problem.

An internal error occurred during: "Project serialization job".
null argument:

The stack in the Eclipse .log will look like this:

!MESSAGE An internal error occurred during: "Project serialization job".
!STACK 0
org.eclipse.core.runtime.AssertionFailedException: null argument:
	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:88)
	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:76)
	at com.microfocus.eclipse.remote.resolvers.PureRemoteProjectPathResolver.initialize(PureRemoteProjectPathResolver.java:90)
	at com.microfocus.eclipse.core.internal.resource.resolvers.PathResolverExtensionFactory.createResolver(PathResolverExtensionFactory.java:56)
	at com.microfocus.eclipse.project.model.AbstractMicroFocusProject.getPathResolver(AbstractMicroFocusProject.java:522)
	at com.microfocus.eclipse.project.serialisation.AbstractBuildFileSerializationParticipant.getPrecedenceName(AbstractBuildFileSerializationParticipant.java:1305)
	at com.microfocus.eclipse.project.serialisation.AbstractBuildFileSerializationParticipant.requiresCompilation(AbstractBuildFileSerializationParticipant.java:1333)
	at com.microfocus.eclipse.project.serialisation.AbstractCobolBuildFileSerializationParticipant.buildDirectiveSets(AbstractCobolBuildFileSerializationParticipant.java:240)
	at com.microfocus.eclipse.project.internal.serialisation.CobolBuildFileSerializationParticipant.generateCobolDirectivesAndFiles(CobolBuildFileSerializationParticipant.java:859)
	at com.microfocus.eclipse.project.internal.serialisation.CobolBuildFileSerializationParticipant.generateSpecificConfigurations(CobolBuildFileSerializationParticipant.java:663)
	at com.microfocus.eclipse.project.internal.serialisation.BuildFileSerializer.generateSpecificConfigurations(BuildFileSerializer.java:266)
	at com.microfocus.eclipse.project.internal.serialisation.BuildFileSerializer.doSerialize(BuildFileSerializer.java:153)
	at com.microfocus.eclipse.project.serialisation.AbstractProjectSerializer.serialise(AbstractProjectSerializer.java:81)
	at com.microfocus.eclipse.project.internal.serialisation.ProjectSerializationContext.runSerializers(ProjectSerializationContext.java:276)
	at com.microfocus.eclipse.project.internal.serialisation.ProjectSerializationJob.runInWorkspace(ProjectSerializationJob.java:91)
	at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:42)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

Full article: https://portal.microfocus.com/s/article/KM000010591