deduplicate: different file contents found when use sbt-assembly

[almothafar]

Simply I have stopper issue here, i'm trying to get jar file for play application with sbt-assembly like here :

https://www.playframework.com/documentation/2.5.x/Deploying#Using-the-SBT-assembly-plugin

just to make sure its working exactly like my environment my plugins.sbt:

// The Play plugin
addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.5.3")

// Web plugins
addSbtPlugin("com.typesafe.sbt" % "sbt-coffeescript" % "1.0.0")
addSbtPlugin("com.typesafe.sbt" % "sbt-less" % "1.1.0")
addSbtPlugin("com.typesafe.sbt" % "sbt-jshint" % "1.0.3")
addSbtPlugin("com.typesafe.sbt" % "sbt-rjs" % "1.0.7")
addSbtPlugin("com.typesafe.sbt" % "sbt-digest" % "1.1.0")
addSbtPlugin("com.typesafe.sbt" % "sbt-mocha" % "1.1.0")
addSbtPlugin("org.irundaia.sbt" % "sbt-sassify" % "1.4.2")

// Play enhancer - this automatically generates getters/setters for public fields
// and rewrites accessors of these fields to use the getters/setters. Remove this
// plugin if you prefer not to have this feature, or disable on a per project
// basis using disablePlugins(PlayEnhancer) in your build.sbt
addSbtPlugin("com.typesafe.sbt" % "sbt-play-enhancer" % "1.1.0")

// Play Ebean support, to enable, uncomment this line, and enable in your build.sbt using
// enablePlugins(PlayEbean). Note, uncommenting this line will automatically bring in
// Play enhancer, regardless of whether the line above is commented out or not.
addSbtPlugin("com.typesafe.sbt" % "sbt-play-ebean" % "3.0.1")

// Gulp play
addSbtPlugin("com.github.mmizutani" % "sbt-play-gulp" % "0.1.1")

addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.3")

My build.sbt:

name := """App Name"""

version := "1.0-SNAPSHOT"

lazy val root = (project in file(".")).enablePlugins(PlayJava, PlayEbean)

scalaVersion := "2.11.8"

libraryDependencies ++= Seq(
  javaJdbc,
  cache,
  javaWs,
  filters,
  evolutions,
  "mysql" % "mysql-connector-java" % "5.1.38",
  "com.typesafe.play" %% "play-mailer" % "5.0.0-M1",
  "org.mapstruct" % "mapstruct-jdk8" % "1.1.0.Beta1",
  "org.mapstruct" % "mapstruct-processor" % "1.1.0.Beta1",
  "commons-io" % "commons-io" % "2.4",
  "org.apache.poi" % "poi" % "3.14",
  "org.apache.poi" % "poi-ooxml" % "3.14" % "provided"
)

libraryDependencies ~= {
  _ map {
    case m if m.organization == "com.typesafe.play" =>
      m.exclude("commons-logging", "commons-logging")
    case m => m
  }
}

mainClass in assembly := Some("play.core.server.ProdServerStart")

fullClasspath in assembly += Attributed.blank(PlayKeys.playPackageAssets.value)

Then when I do activator assembly I get:

[error] deduplicate: different file contents found in the following:
[error] com/github/mmizutani/playgulp/javascript/ReverseGulpAssets.class
[error] C:\Users\almothafar\.ivy2\cache\com.github.mmizutani\play-gulp_2.11\jars\play-gulp_2.11-0.1.1.jar:com/github/mmizutani/playgulp/javascript/ReverseGulpAssets.class
[error] deduplicate: different file contents found in the following:
[error] com/github/mmizutani/playgulp/routes$javascript.class
[error] C:\Users\almothafar\.ivy2\cache\com.github.mmizutani\play-gulp_2.11\jars\play-gulp_2.11-0.1.1.jar:com/github/mmizutani/playgulp/routes$javascript.class
[error] deduplicate: different file contents found in the following:
[error] com/github/mmizutani/playgulp/routes.class
[error] C:\Users\almothafar\.ivy2\cache\com.github.mmizutani\play-gulp_2.11\jars\play-gulp_2.11-0.1.1.jar:com/github/mmizutani/playgulp/routes.class
[error] Total time: 20 s, completed Jun 1, 2016 2:31:26 PM

The problem simply is the files inside the javascript folder com/github/mmizutani/playgulp/javascript conflicts with the one in com/github/mmizutani/playgulp and routes conflicts too.