SBT Cannot resolve dependencies

Add addSbtPlugin("com.typesafe.sbt" % "sbt-less" % "1.0.0") to plugins.sbt. Run sbt. Dependencies for jse and npm can't be resolved:

[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: UNRESOLVED DEPENDENCIES ::
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: com.typesafe#jse_2.10;1.0.0: not found
[warn] :: com.typesafe#npm_2.10;1.0.0: not found
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
sbt.ResolveException: unresolved dependency: com.typesafe#jse_2.10;1.0.0: not found
unresolved dependency: com.typesafe#npm_2.10;1.0.0: not found
at sbt.IvyActions$.sbt$IvyActions$$resolve(IvyActions.scala:217)
at sbt.IvyActions$$anonfun$update$1.apply(IvyActions.scala:126)
at sbt.IvyActions$$anonfun$update$1.apply(IvyActions.scala:125)
at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:115)
at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:115)
at sbt.IvySbt$$anonfun$withIvy$1.apply(Ivy.scala:103)
at sbt.IvySbt.sbt$IvySbt$$action$1(Ivy.scala:48)
at sbt.IvySbt$$anon$3.call(Ivy.scala:57)
at xsbt.boot.Locks$GlobalLock.withChannel$1(Locks.scala:98)
at xsbt.boot.Locks$GlobalLock.xsbt$boot$Locks$GlobalLock$$withChannelRetries$1(Locks.scala:81)
at xsbt.boot.Locks$GlobalLock$$anonfun$withFileLock$1.apply(Locks.scala:102)
at xsbt.boot.Using$.withResource(Using.scala:11)

解决方法：在plugin.sbt 中添加

resolvers += Resolver.typesafeRepo("releases")