After building daffodil with sbt build, I ran sbt publish-local, which finished succesfully. I then went into the daffodil-pack directory and attempted to run sbt pack and got the following stack trace:

$ sbt pack
[info] Loading project definition from C:\cygwin\home\jadams\dfdl\daffodil-pack\project
[info] Set current project to daffodil (in build file:/C:/cygwin/home/jadams/dfdl/daffodil-pack/)
java.lang.RuntimeException: Failed to pack file: C:\cygwin\home\jadams\dfdl\daffodil-pack\target\scala-2.9.2\pack\daffodil-0.7.0-SNAPSHOT.tar.bz2
at scala.sys.package$.error(package.scala:27)
at DaffodilBuild$$anonfun$packFiles$1.apply(build.scala:118)
at DaffodilBuild$$anonfun$packFiles$1.apply(build.scala:86)
at sbt.IO$.withTemporaryDirectory(IO.scala:281)
at DaffodilBuild$.packFiles(build.scala:86)
at DaffodilBuild$$anonfun$tarTaskSettings$1.apply(build.scala:20)
at DaffodilBuild$$anonfun$tarTaskSettings$1.apply(build.scala:19)
at sbt.Scoped$$anonfun$hf4$1.apply(Structure.scala:580)
at sbt.Scoped$$anonfun$hf4$1.apply(Structure.scala:580)
at scala.Function1$$anonfun$compose$1.apply(Function1.scala:49)
at sbt.Scoped$Reduced$$anonfun$combine$1$$anonfun$apply$12.apply(Structure.scala:311)
at sbt.Scoped$Reduced$$anonfun$combine$1$$anonfun$apply$12.apply(Structure.scala:311)
at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:41)
at sbt.std.Transform$$anon$5.work(System.scala:71)
at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:232)
at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:232)
at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:18)
at sbt.Execute.work(Execute.scala:238)
at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:232)
at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:232)
at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:160)
at sbt.CompletionService$$anon$2.call(CompletionService.scala:30)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
[error] (*:pack-tar) Failed to pack file: C:\cygwin\home\jadams\dfdl\daffodil-pack\target\scala-2.9.2\pack\daffodil-0.7.0-SNAPSHOT.tar.bz2
[error] Total time: 3 s, completed Mar 11, 2013 1:08:24 PM