Mill Build issue

build.sc

import $ivy.`com.goyeau::mill-git:e8d8fae`
import $ivy.`com.goyeau::mill-scalafix:0.1.5`
import $ivy.`com.lihaoyi::mill-contrib-bloop:$MILL_VERSION`
import $ivy.`io.github.davidgregory084::mill-tpolecat:0.1.4`

import mill._
import mill.scalalib._
import mill.scalajslib._
import publish._
import mill.scalalib.scalafmt._
import com.goyeau.mill.git.GitVersionedPublishModule
import com.goyeau.mill.git.GitVersionModule
import com.goyeau.mill.scalafix.ScalafixModule
import io.github.davidgregory084.TpolecatModule

object Deps {

  object ScalaVersions {
    val scala211 = Version.withRevision(2, 11, 12)
    val scala212 = Version.withRevision(2, 12, 10)
    val scala213 = Version.withRevision(2, 13, 3)
    val scalaJS06 = Version.withRevision(0, 6, 32)
    val scalaJS1 = Version.withRevision(1, 0, 0)

    val selected = scala211
  }

  object Scala_2_11 {
    val acyclic = ivy"com.lihaoyi::acyclic:0.1.9"

    val fastparse = ivy"com.lihaoyi::fastparse:2.1.2"

    val paradise = ivy"org.scalamacros:::paradise:2.1.1"

    val pprint = ivy"com.lihaoyi::pprint:0.5.4"
  }

  object Scala_2_12 {
    val paradise = ivy"org.scalamacros:::paradise:2.1.1"
  }

  val acyclic = ivy"com.lihaoyi::acyclic:0.2.0"

  val fastparse = ivy"com.lihaoyi::fastparse:2.3.0"

  val newtype = ivy"io.estatico::newtype:0.4.4"

  val pprint = ivy"com.lihaoyi::pprint:0.6.0"

  val zio = ivy"dev.zio::zio:1.0.0"
  val zioConfig = ivy"dev.zio::zio-config:1.0.0-RC26"
  val zioConfigTypesafe = ivy"dev.zio::zio-config-typesafe:1.0.0-RC26"
  val zioLogging = ivy"dev.zio::zio-logging:0.4.0"
  val zioLoggingSlf4j = ivy"dev.zio::zio-logging-slf4j:0.4.0"
  val zioStreams = ivy"dev.zio::zio-streams:1.0.0"
  val zioTest = ivy"dev.zio::zio-test:1.0.0"
  val zioTestSbt = ivy"dev.zio::zio-test-sbt:1.0.0"

}

trait FlowzPublishModule extends PublishModule {

  //def artifactName = "flowz-" + super.artifactName()
  def publishVersion = GitVersionModule.version(withSnapshotSuffix = true)

  def pomSettings = PomSettings(
    description = artifactName(),
    organization = "damianreeves.com",
    url = "https://github.com/DamianReeves/flowz",
    licenses = Seq(License.MIT),
    versionControl = VersionControl.github("DamianReeves", "flowz"),
    developers = Seq(
      Developer("DamianReeves", "Damian Reeves", "https://github.com/DamianReeves")
    )
  )

  def javacOptions = Seq("-source", "1.8", "-target", "1.8")
}

trait ScalaProject
    extends FlowzPublishModule
    with ScalaModule
    with ScalafmtModule
    with ScalafixModule
    with TpolecatModule {

  def crossScalaVersion: Version
  def scalaVersion = T { crossScalaVersion.fullVersion }
  def compileIvyDeps = crossScalaVersion match {
    case Version(2, 11) => Agg(Deps.Scala_2_11.acyclic)
    case _              => Agg(Deps.acyclic)
  }

  def scalacPluginIvyDeps = crossScalaVersion match {
    case Version(2, 11) => Agg(Deps.Scala_2_11.acyclic)
    case _              => Agg(Deps.acyclic)
  }

  trait Tests extends super.Tests with ScalaTestProject
}

trait ScalaTestProject
    extends ScalaModule
    with TestModule
    with ScalafmtModule
    with ScalafixModule
    with TpolecatModule {

  def ivyDeps = Agg(
    Deps.zioTest,
    Deps.zioTestSbt
  )

  def testFrameworks =
    Seq("zio.test.sbt.ZTestFramework")
}

abstract class FlowzScalaCrossProject(val crossScalaVersion: Version) extends ScalaProject {}

object flowz extends Module {
  import Deps.ScalaVersions._
  object core extends mill.Cross[CoreModule](scala211, scala212, scala213)

  class CoreModule(crossScalaVersion: Version) extends FlowzScalaCrossProject(crossScalaVersion) {
    def ivyDeps = {
      val common = Agg(Deps.zio, Deps.zioLogging)
      crossScalaVersion match {
        case Version(2, 11) =>
          common ++ Agg(Deps.Scala_2_11.fastparse)
        case _ =>
          common ++ Agg(Deps.fastparse)
      }
    }

    override def scalacPluginIvyDeps = T {
      val original = super.scalacPluginIvyDeps()
      val additional = crossScalaVersion match {
        case Version(2, 11) =>
          Agg(Deps.Scala_2_11.paradise)
        case Version(2, 12) =>
          Agg(Deps.Scala_2_12.paradise)
      }
      original ++ additional
    }

    object test extends Tests
  }

  // object spark extends ScalaProject {
  //   def moduleDeps = Seq(core)

  //   def ivyDeps = Agg(
  //     Deps.spark.sql()
  //   )

  //   object test extends Tests
  // }

  // object samples extends Module {
  //   object basic extends ScalaProject {

  //     def ivyDeps = Agg(
  //       Deps.zio()
  //     )

  //     def moduleDeps = Seq(flowz.core)
  //   }
  // }
}

sealed abstract class Version extends Product with Serializable {
  def major: Int
  def minor: Int
  def fullVersion: String
  override def toString(): String = fullVersion
}

object Version {
  def majorMinor(major: Int, minor: Int): Version =
    MajorMinor(major, minor)

  def withRevision(major: Int, minor: Int, revision: Int): Version =
    MajorMinorRevision(major, minor, revision)

  def unapply(version: Version): Option[(Int, Int)] = version match {
    case MajorMinor(major, minor)                  => Some((major, minor))
    case MajorMinorRevision(major, minor, _)       => Some((major, minor))
    case MajorMinorRevisionTag(major, minor, _, _) => Some((major, minor))
  }

  object MajorMinorVersion {
    def unapply(version: Version): Option[(Int, Int)] = version match {
      case MajorMinor(major, minor)                  => Some((major, minor))
      case MajorMinorRevision(major, minor, _)       => Some((major, minor))
      case MajorMinorRevisionTag(major, minor, _, _) => Some((major, minor))
    }
  }

  final case class MajorMinor(major: Int, minor: Int) extends Version {
    def fullVersion: String = s"$major.$minor"
  }

  final case class MajorMinorRevision(major: Int, minor: Int, revision: Int) extends Version {
    def fullVersion: String = s"$major.$minor.$revision"
  }

  final case class MajorMinorRevisionTag(major: Int, minor: Int, revision: Int, tag: String)
      extends Version {
    def fullVersion: String = s"$major.$minor.$revision-$tag"
  }

}

Error.md

Exception in thread "MillServerActionRunner" java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at mill.define.Module$Internal.$anonfun$reflect$4(Module.scala:73) at scala.collection.ArrayOps$WithFilter.map(ArrayOps.scala:90) at mill.define.Module$Internal.reflect(Module.scala:64) at mill.define.Module$Internal.reflectAll(Module.scala:76) at mill.define.Module$Internal.reflectNestedObjects(Module.scala:84) at mill.define.Module.millModuleDirectChildren$lzycompute(Module.scala:27) at mill.define.Module.millModuleDirectChildren(Module.scala:27) at mill.define.Module$Internal.rec$1(Module.scala:42) at mill.define.Module$Internal.$anonfun$traverse$1(Module.scala:42) at scala.collection.StrictOptimizedIterableOps.flatMap(StrictOptimizedIterableOps.scala:117) at scala.collection.StrictOptimizedIterableOps.flatMap$(StrictOptimizedIterableOps.scala:104) at scala.collection.immutable.ArraySeq.flatMap(ArraySeq.scala:35) at mill.define.Module$Internal.rec$1(Module.scala:42) at mill.define.Module$Internal.traverse(Module.scala:43) at mill.define.Module$Internal.modules$lzycompute(Module.scala:46) at mill.define.Module$Internal.modules(Module.scala:46) at mill.main.Resolve.resolve(Resolve.scala:378) at mill.main.RunScript$.$anonfun$resolveTasks$4(RunScript.scala:145) at scala.util.Either.map(Either.scala:382) at mill.main.RunScript$.$anonfun$resolveTasks$3(RunScript.scala:134) at scala.collection.immutable.List.map(List.scala:246) at mill.main.RunScript$.$anonfun$resolveTasks$2(RunScript.scala:133) at scala.util.Either.flatMap(Either.scala:352) at mill.main.RunScript$.resolveTasks(RunScript.scala:130) at mill.main.RunScript$.evaluateTasks(RunScript.scala:187) at mill.main.RunScript$.$anonfun$runScript$4(RunScript.scala:66) at ammonite.util.Res$Success.flatMap(Res.scala:62) at mill.main.RunScript$.runScript(RunScript.scala:65) at mill.main.MainRunner.$anonfun$runScript$1(MainRunner.scala:115) at mill.main.MainRunner.watchLoop2(MainRunner.scala:64) at mill.main.MainRunner.runScript(MainRunner.scala:90) at mill.MillMain$.main0(MillMain.scala:269) at mill.main.MillServerMain$.main0(MillServerMain.scala:67) at mill.main.Server.$anonfun$handleRun$1(MillServerMain.scala:154) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: java.lang.ClassCastException: class java.lang.Integer cannot be cast to class ammonite.$file.build$Version (java.lang.Integer is in module java.base of loader 'bootstrap'; ammonite.$file.build$Version is in unnamed module of loader ammonite.runtime.SpecialClassLoader @42bf2083) at ammonite.$file.build$flowz$core$$anonfun$$lessinit$greater$1$$anon$1.(build.sc:122) at ammonite.$file.build$flowz$core$$anonfun$$lessinit$greater$1.apply(build.sc:122) at ammonite.$file.build$flowz$core$$anonfun$$lessinit$greater$1.apply(build.sc:122) at mill.define.Cross.$anonfun$items$1(Cross.scala:62) at scala.collection.immutable.List.map(List.scala:246) at mill.define.Cross.(Cross.scala:53) at ammonite.$file.build$flowz$core$.(build.sc:122) at ammonite.$file.build$flowz$.core$lzycompute$1(build.sc:122) at ammonite.$file.build$flowz$.core(build.sc:122) ... 39 more