Unable to create session

[fountainheadpro]

val lgn = Lightning(host = "http://boot2docker:3000/")
lgn.createSession("word-cloud")
org.json4s.ParserUtil$ParseException: unknown token <
Near: <
at org.json4s.native.JsonParser$Parser.fail(JsonParser.scala:207)
at org.json4s.native.JsonParser$Parser.nextToken(JsonParser.scala:294)
at org.json4s.native.JsonParser$$anonfun$1.apply(JsonParser.scala:159)
at org.json4s.native.JsonParser$$anonfun$1.apply(JsonParser.scala:117)
at org.json4s.native.JsonParser$.parse(JsonParser.scala:105)
at org.json4s.native.JsonParser$.parse(JsonParser.scala:53)
at org.json4s.native.JsonMethods$class.parse(JsonMethods.scala:11)
at org.json4s.native.JsonMethods$.parse(JsonMethods.scala:61)
at org.viz.lightning.Lightning.post(Lightning.scala:87)
at org.viz.lightning.Lightning.createSession(Lightning.scala:29)
at .(:12)
at .()
at .(:7)
at .()
at $print()
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:734)
at scala.tools.nsc.interpreter.IMain$Request.loadAndRun(IMain.scala:983)
at scala.tools.nsc.interpreter.IMain.loadAndRunReq$1(IMain.scala:573)
at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:604)
at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:568)
at scala.tools.nsc.interpreter.ILoop.reallyInterpret$1(ILoop.scala:760)
at scala.tools.nsc.interpreter.ILoop.interpretStartingWith(ILoop.scala:805)
at scala.tools.nsc.interpreter.ILoop.command(ILoop.scala:717)
at scala.tools.nsc.interpreter.ILoop.processLine$1(ILoop.scala:581)
at scala.tools.nsc.interpreter.ILoop.innerLoop$1(ILoop.scala:588)
at scala.tools.nsc.interpreter.ILoop.loop(ILoop.scala:591)
at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply$mcZ$sp(ILoop.scala:882)
at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:837)
at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:837)
at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)
at scala.tools.nsc.interpreter.ILoop.process(ILoop.scala:837)
at scala.tools.nsc.interpreter.ILoop.main(ILoop.scala:904)
at xsbt.ConsoleInterface.run(ConsoleInterface.scala:62)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:101)
at sbt.compiler.AnalyzingCompiler.console(AnalyzingCompiler.scala:76)
at sbt.Console.sbt$Console$$console0$1(Console.scala:22)
at sbt.Console$$anonfun$apply$2$$anonfun$apply$1.apply$mcV$sp(Console.scala:23)
at sbt.Console$$anonfun$apply$2$$anonfun$apply$1.apply(Console.scala:23)
at sbt.Console$$anonfun$apply$2$$anonfun$apply$1.apply(Console.scala:23)
at sbt.Logger$$anon$4.apply(Logger.scala:85)
at sbt.TrapExit$App.run(TrapExit.scala:248)
at java.lang.Thread.run(Thread.java:745)

[AdrianP-]

Try to remove the last "/" in this way:

val lgn = Lightning(host = "http://boot2docker:3000")

[carsonpun]

I ran into the same issue before. But I resolved and able to plot by confirming the
scala REPL is the same version of the lightning jar created through sbt assembly (this is very important)

In my original failed case, my scala REPL was 2.11.6 but the jar was in 2.10.x after moved all of them to 2.11.6 I can perform the plotting.

[ucrkarthik]

So how did you move the lightning-scala project to 2.11.6? Did you just update the scalaVersion value to "2.11.6" in the build.sbt file and run "sbt assembly" to create a new assembly jar? Did you have to update any other artifact jar versions?

[carsonpun]

I only changed the build.sbt for the followings:
from:
scalaVersion := "2.10.3"
to:
scalaVersion := "2.11.6"