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java.lang.IllegalArgumentException: null	at sun.nio.fs.UnixPath.subpath(UnixPath.java:346)	at sun.nio.fs.UnixPath.subpath(UnixPath.java:43)	at cromwell.backend.io.JobPathsWithDocker.toDockerPath(JobPathsWithDocker.scala:35)	at cromwell.backend.sfs.SharedFileSystemAsyncJobExecutionActor$class.toUnixPath(SharedFileSystemAsyncJobExecutionActor.scala:107)	at cromwell.backend.impl.sfs.config.BackgroundConfigAsyncJobExecutionActor.toUnixPath(ConfigAsyncJobExecutionActor.scala:113)	at cromwell.backend.sfs.SharedFileSystemAsyncJobExecutionActor$$anonfun$commandLineValueMapper$1.apply(SharedFileSystemAsyncJobExecutionActor.scala:127)	at cromwell.backend.sfs.SharedFileSystemAsyncJobExecutionActor$$anonfun$commandLineValueMapper$1.apply(SharedFileSystemAsyncJobExecutionActor.scala:127)	at wdl4s.command.ParameterCommandPart.instantiate(ParameterCommandPart.scala:55)	at wdl4s.Task$$anonfun$instantiateCommand$1$$anonfun$apply$2.apply(Task.scala:108)	at wdl4s.Task$$anonfun$instantiateCommand$1$$anonfun$apply$2.apply(Task.scala:108)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)	at scala.collection.Iterator$class.foreach(Iterator.scala:893)	at scala.collection.AbstractIterator.foreach(Iterator.scala:1336)	at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)	at scala.collection.AbstractIterable.foreach(Iterable.scala:54)	at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)	at scala.collection.AbstractTraversable.map(Traversable.scala:104)	at wdl4s.Task$$anonfun$instantiateCommand$1.apply(Task.scala:108)	at wdl4s.Task$$anonfun$instantiateCommand$1.apply(Task.scala:108)	at scala.util.Try$.apply(Try.scala:192)	at wdl4s.Task.instantiateCommand(Task.scala:108)	at cromwell.backend.wdl.Command$$anonfun$instantiate$1.apply(Command.scala:28)	at cromwell.backend.wdl.Command$$anonfun$instantiate$1.apply(Command.scala:27)	at scala.util.Success.flatMap(Try.scala:231)	at cromwell.backend.wdl.Command$.instantiate(Command.scala:27)	at cromwell.backend.standard.StandardAsyncExecutionActor$class.instantiatedCommand(StandardAsyncExecutionActor.scala:80)	at cromwell.backend.impl.sfs.config.BackgroundConfigAsyncJobExecutionActor.instantiatedCommand$lzycompute(ConfigAsyncJobExecutionActor.scala:113)	at cromwell.backend.impl.sfs.config.BackgroundConfigAsyncJobExecutionActor.instantiatedCommand(ConfigAsyncJobExecutionActor.scala:113)	at cromwell.backend.sfs.SharedFileSystemAsyncJobExecutionActor$class.execute(SharedFileSystemAsyncJobExecutionActor.scala:130)	at cromwell.backend.impl.sfs.config.BackgroundConfigAsyncJobExecutionActor.execute(ConfigAsyncJobExecutionActor.scala:113)	at cromwell.backend.standard.StandardAsyncExecutionActor$$anonfun$executeOrRecover$2.apply(StandardAsyncExecutionActor.scala:264)	at cromwell.backend.standard.StandardAsyncExecutionActor$$anonfun$executeOrRecover$2.apply(StandardAsyncExecutionActor.scala:258)	at scala.util.Try$.apply(Try.scala:192)	at cromwell.backend.standard.StandardAsyncExecutionActor$class.executeOrRecover(StandardAsyncExecutionActor.scala:258)	at cromwell.backend.impl.sfs.config.BackgroundConfigAsyncJobExecutionActor.executeOrRecover(ConfigAsyncJobExecutionActor.scala:113)	at cromwell.backend.async.AsyncBackendJobExecutionActor$$anonfun$cromwell$backend$async$AsyncBackendJobExecutionActor$$robustExecuteOrRecover$1.apply(AsyncBackendJobExecutionActor.scala:56)	at cromwell.backend.async.AsyncBackendJobExecutionActor$$anonfun$cromwell$backend$async$AsyncBackendJobExecutionActor$$robustExecuteOrRecover$1.apply(AsyncBackendJobExecutionActor.scala:56)	at cromwell.core.retry.Retry$.withRetry(Retry.scala:37)	at cromwell.backend.async.AsyncBackendJobExecutionActor$class.withRetry(AsyncBackendJobExecutionActor.scala:52)	at cromwell.backend.async.AsyncBackendJobExecutionActor$class.cromwell$backend$async$AsyncBackendJobExecutionActor$$robustExecuteOrRecover(AsyncBackendJobExecutionActor.scala:56)	at cromwell.backend.async.AsyncBackendJobExecutionActor$$anonfun$receive$1.applyOrElse(AsyncBackendJobExecutionActor.scala:80)	at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)	at akka.actor.Actor$class.aroundReceive(Actor.scala:496)	at cromwell.backend.impl.sfs.config.BackgroundConfigAsyncJobExecutionActor.aroundReceive(ConfigAsyncJobExecutionActor.scala:113)	at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)	at akka.actor.ActorCell.invoke(ActorCell.scala:495)	at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)	at akka.dispatch.Mailbox.run(Mailbox.scala:224)	at akka.dispatch.Mailbox.exec(Mailbox.scala:234)	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)