ListFiles fails when using a relative path

I created a ListFile processor and set the Input Directory to "./data/in/csv"

When I started the Processor, it just started spewing errors like below:

2015-12-03 13:27:53,563 ERROR [Timer-Driven Process Thread-2] o.a.nifi.processors.standard.ListFile ListFile[id=20971eba-bee8-483f-80fd-a02563288da2] ListFile[id=20971eba-bee8-483f-80fd-a02563288da2] failed to process session due to java.lang.IllegalArgumentException: 'other' is different type of Path: java.lang.IllegalArgumentException: 'other' is different type of Path
2015-12-03 13:27:53,563 WARN [Timer-Driven Process Thread-2] o.a.nifi.processors.standard.ListFile ListFile[id=20971eba-bee8-483f-80fd-a02563288da2] Processor Administratively Yielded for 1 sec due to processing failure
2015-12-03 13:27:53,563 WARN [Timer-Driven Process Thread-2] o.a.n.c.t.ContinuallyRunProcessorTask Administratively Yielding ListFile[id=20971eba-bee8-483f-80fd-a02563288da2] due to uncaught Exception: java.lang.IllegalArgumentException: 'other' is different type of Path
2015-12-03 13:27:53,564 WARN [Timer-Driven Process Thread-2] o.a.n.c.t.ContinuallyRunProcessorTask
java.lang.IllegalArgumentException: 'other' is different type of Path
at sun.nio.fs.UnixPath.relativize(UnixPath.java:416) ~[na:1.8.0_60]
at sun.nio.fs.UnixPath.relativize(UnixPath.java:43) ~[na:1.8.0_60]
at org.apache.nifi.processors.standard.ListFile.createAttributes(ListFile.java:223) ~[na:na]
at org.apache.nifi.processors.standard.ListFile.createAttributes(ListFile.java:65) ~[na:na]
at org.apache.nifi.processors.standard.AbstractListProcessor.onTrigger(AbstractListProcessor.java:382) ~[na:na]
at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27) ~[nifi-api-0.4.0-SNAPSHOT.jar:0.4.0-SNAPSHOT]
at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1146) ~[nifi-framework-core-0.4.0-SNAPSHOT.jar:0.4.0-SNAPSHOT]
at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:139) [nifi-framework-core-0.4.0-SNAPSHOT.jar:0.4.0-SNAPSHOT]
at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:49) [nifi-framework-core-0.4.0-SNAPSHOT.jar:0.4.0-SNAPSHOT]
at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:119) [nifi-framework-core-0.4.0-SNAPSHOT.jar:0.4.0-SNAPSHOT]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_60]
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [na:1.8.0_60]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_60]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [na:1.8.0_60]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_60]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_60]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_60]