scala - PlayFramework: Error during sbt execution: java.lang.NoClassDefFoundError: scalax/io/Seekable -

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i have downloaded play 2.2.2.rc2 however, when run play command output get. doing wrong?

java.lang.noclassdeffounderror: scalax/io/seekable     @ java.lang.classloader.defineclass1(native method)     @ java.lang.classloader.defineclass(classloader.java:800)     @ java.security.secureclassloader.defineclass(secureclassloader.java:142)     @ java.net.urlclassloader.defineclass(urlclassloader.java:449)     @ java.net.urlclassloader.access$100(urlclassloader.java:71)     @ java.net.urlclassloader$1.run(urlclassloader.java:361)     @ java.net.urlclassloader$1.run(urlclassloader.java:355)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(urlclassloader.java:354)     @ java.lang.classloader.loadclass(classloader.java:425)     @ java.lang.classloader.loadclass(classloader.java:358)     @ java.lang.classloader.defineclass1(native method)     @ java.lang.classloader.defineclass(classloader.java:800)     @ java.security.secureclassloader.defineclass(secureclassloader.java:142)     @ java.net.urlclassloader.defineclass(urlclassloader.java:449)     @ java.net.urlclassloader.access$100(urlclassloader.java:71)     @ java.net.urlclassloader$1.run(urlclassloader.java:361)     @ java.net.urlclassloader$1.run(urlclassloader.java:355)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(urlclassloader.java:354)     @ java.lang.classloader.loadclass(classloader.java:425)     @ java.lang.classloader.loadclass(classloader.java:358)     @ play.console.console.run(console.scala:201)     @ play.console.console.run(console.scala:198)     @ xsbt.boot.launch$$anonfun$run$1.apply(launch.scala:57)     @ xsbt.boot.launch$.withcontextloader(launch.scala:77)     @ xsbt.boot.launch$.run(launch.scala:57)     @ xsbt.boot.launch$$anonfun$explicit$1.apply(launch.scala:45)     @ xsbt.boot.launch$.launch(launch.scala:65)     @ xsbt.boot.launch$.apply(launch.scala:16)     @ xsbt.boot.boot$.runimpl(boot.scala:32)     @ xsbt.boot.boot$.main(boot.scala:21)     @ xsbt.boot.boot.main(boot.scala) caused by: java.lang.classnotfoundexception: scalax.io.seekable     @ java.net.urlclassloader$1.run(urlclassloader.java:366)     @ java.net.urlclassloader$1.run(urlclassloader.java:355)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(urlclassloader.java:354)     @ java.lang.classloader.loadclass(classloader.java:425)     @ java.lang.classloader.loadclass(classloader.java:358)     ... 33 more error during sbt execution: java.lang.noclassdeffounderror: scalax/io/seekable

it need install sbt;

try running "sbt" in command prompt/console, if 

    cannot find sbt launcher 0.13.0 please download:     http://typesafe.artifactoryonline.com/typesafe/ivy-releases/org.scala-sbt/sbt-launch/0.13.0/sbt-launch.jar      /home/<your home directory>/.sbt/.lib/0.13.0/sbt-launch.jar

then, follow instructions, should work


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