sbt-eclipse,sbt-assembly plugin issue: scala-spark-sbt-plugins

Hi Friends,
I am new to Spark-Scala-sbt area. I am trying to run one sample spark-scala code using sbt and some sbt eclipse and sbt assembly plugins, But not able to package run it due to below issue,:

Created the plugins. sbt file under MyProject/project/ with below :
addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "2.4.0")

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

Environment:
sbt version is 0.13
scala version is 2.10.3

now from my project directory
cd ~/MyProject
MyProject$ sbt package ,getting below error.

[info] Resolving org.scala-sbt#compiler-interface;0.13.1 ...
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: UNRESOLVED DEPENDENCIES ::
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: com.typesafe.sbteclipse#sbteclipse-plugin;2.4.0: not found
[warn] :: com.eed3si9n#sbt-assembly;0.14.3: not found
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn]
[warn] Note: Some unresolved dependencies have extra attributes. Check that these dependencies exist with the requested attributes.
[warn] com.typesafe.sbteclipse:sbteclipse-plugin:2.4.0 (sbtVersion=0.13, scalaVersion=2.10)
[warn] com.eed3si9n:sbt-assembly:0.14.3 (sbtVersion=0.13, scalaVersion=2.10)
[warn]
sbt.ResolveException: unresolved dependency: com.typesafe.sbteclipse#sbteclipse-plugin;2.4.0: not found
unresolved dependency: com.eed3si9n#sbt-assembly;0.14.3: not found

Checked some solution but unfortunately not working for me.

Start with MyProject/project/plugins.sbt and reproduce the failure with sbt package under sbt 0.13 and Scala 2.10.3. Check why the requested sbteclipse-plugin 2.4.0 and sbt-assembly 0.14.3 dependencies are unresolved; done means both plugins resolve successfully and the sample project packages.