Error while installing PlayFramework - scala

Question

H Friends,
the command "activator ui" it downloaded a lot of files finally it throws some exception. PFB of the error
Error Message:
======================================================
https://repo.typesafe.com/typesafe/releases/com/typesafe/sbt/client-all-2-11/0.3.5/client-all-2-11-0.3.5.jar ..
[SUCCESSFUL ] com.typesafe.sbt#client-all-2-11;0.3.5!client-all-2-11.jar (10156ms)
:: retrieving :: org.scala-sbt#boot-app
confs: [default]
91 artifacts copied, 0 already retrieved (79872kB/287ms)
Local repository: activator-launcher-local # file:////C:/Users/xxx/activator-1.3.6-minimal/repository
Play server process ID is 6124
[info] play - Application started (Prod)
Oops, cannot start the server.
org.jboss.netty.channel.ChannelException: Failed to bind to: /127.0.0.1:8888
at org.jboss.netty.bootstrap.ServerBootstrap.bind(ServerBootstrap.java:272)
at play.core.server.NettyServer$$anonfun$8.apply(NettyServer.scala:138)
at play.core.server.NettyServer$$anonfun$8.apply(NettyServer.scala:135)
at scala.Option.map(Option.scala:146)
at play.core.server.NettyServer.<init>(NettyServer.scala:135)
at play.core.server.NettyServer$.createServer(NettyServer.scala:252)
at play.core.server.NettyServer$$anonfun$main$3.apply(NettyServer.scala:289)
at play.core.server.NettyServer$$anonfun$main$3.apply(NettyServer.scala:284)
at scala.Option.map(Option.scala:146)
at play.core.server.NettyServer$.main(NettyServer.scala:284)
at activator.UIMain$$anonfun$run$1.apply$mcV$sp(UIMain.scala:106)
at activator.UIMain$$anonfun$run$1.apply(UIMain.scala:106)
at activator.UIMain$$anonfun$run$1.apply(UIMain.scala:106)
at activator.UIMain.withContextClassloader(UIMain.scala:217)
at activator.UIMain.run(UIMain.scala:106)
at activator.UIMain.run(UIMain.scala:86)
at xsbt.boot.Launch$$anonfun$run$1.apply(Launch.scala:109)
at xsbt.boot.Launch$.withContextLoader(Launch.scala:128)
at xsbt.boot.Launch$.run(Launch.scala:109)
at xsbt.boot.Launch$$anonfun$apply$1.apply(Launch.scala:35)
at xsbt.boot.Launch$.launch(Launch.scala:117)
at xsbt.boot.Launch$.apply(Launch.scala:18)
at xsbt.boot.Boot$.runImpl(Boot.scala:41)
at xsbt.boot.Boot$.main(Boot.scala:17)
at xsbt.boot.Boot.main(Boot.scala)
Caused by: java.net.BindException: Address already in use: bind
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Unknown Source)
at sun.nio.ch.Net.bind(Unknown Source)
at sun.nio.ch.ServerSocketChannelImpl.bind(Unknown Source)
at sun.nio.ch.ServerSocketAdaptor.bind(Unknown Source)
at org.jboss.netty.channel.socket.nio.NioServerBoss$RegisterTask.run(NioServerBoss.java:193)
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.processTaskQueue(AbstractNioSelector.java:391)
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:315)
at org.jboss.netty.channel.socket.nio.NioServerBoss.run(NioServerBoss.java:42)
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
I checked the previous questions but they are not resembling my issue

Answer 1

You have a process that is already using that port. You need to kill that process to free it:
On a mac:
lsof -i tcp:3000 to find the process. Then,
kill -9 <PID> to kill the process
On windows:
netstat -a -n -o | find "<PORT>" to find the process. Then,
taskkill /pid <PID>