rchain/sbt assembly failure

gistfile1.txt

[warn] Merging 'reference.conf' with strategy 'concat'
[error] 1 error was encountered during merge
[error] java.lang.RuntimeException: deduplicate: different file contents found in the following:
[error] logback.xml
[error] logback.xml
[error]         at sbtassembly.Assembly$.applyStrategies(Assembly.scala:141)
[error]         at sbtassembly.Assembly$.x$1$lzycompute$1(Assembly.scala:25)
[error]         at sbtassembly.Assembly$.x$1$1(Assembly.scala:23)
[error]         at sbtassembly.Assembly$.stratMapping$lzycompute$1(Assembly.scala:23)
[error]         at sbtassembly.Assembly$.stratMapping$1(Assembly.scala:23)
[error]         at sbtassembly.Assembly$.inputs$lzycompute$1(Assembly.scala:67)
[error]         at sbtassembly.Assembly$.inputs$1(Assembly.scala:57)
[error]         at sbtassembly.Assembly$.apply(Assembly.scala:84)
[error]         at sbtassembly.Assembly$.$anonfun$assemblyTask$1(Assembly.scala:249)
[error]         at scala.Function1.$anonfun$compose$1(Function1.scala:44)
[error]         at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:39)
[error]         at sbt.std.Transform$$anon$4.work(System.scala:66)
[error]         at sbt.Execute.$anonfun$submit$2(Execute.scala:262)
[error]         at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:16)
[error]         at sbt.Execute.work(Execute.scala:271)
[error]         at sbt.Execute.$anonfun$submit$1(Execute.scala:262)
[error]         at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:174)
[error]         at sbt.CompletionService$$anon$2.call(CompletionService.scala:36)
[error]         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error]         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[error]         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error]         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[error]         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[error]         at java.lang.Thread.run(Thread.java:748)
[error] (assembly) deduplicate: different file contents found in the following:
[error] logback.xml
[error] logback.xml
[error] Total time: 13 s, completed Aug 30, 2018 1:04:28 PM