Error while Executing Scala constructs with Spark

I have a simple scala object file with the following content:

import org.apache.spark.SparkContext  
import org.apache.spark.SparkContext._ 
import org.apache.spark.SparkConf  


object X { 
      def main(args: Array[String]) {

        val params = Map[String, String](
            "abc" -> "22",)
      println("Creating Spark Configuration");
      val conf = new SparkConf().setAppName("X")
      val sc = new SparkContext(conf)
      val txtFileLines = sc.textFile("/tmp/x.txt", 2).cache()
      val count = txtFileLines.count()
      println("Count" + count)
    }
}

My build.sbt looks like:

name := "x"

version := "1.0"

scalaVersion := "2.11.7"

libraryDependencies += "org.apache.spark" %% "spark-core" % "1.5.2" % "provided"

I then do sbt package to create x.jar under target/scala-2.11/

When I execute the above code as: spark-submit --class X --master local[2] x.jar I get the following error:

Creating Spark Configuration
Exception in thread "main" java.lang.NoSuchMethodError: scala.Predef$.ArrowAssoc(Ljava/lang/Object;)Ljava/lang/Object;
    at Sweeper$.main(Sweeper.scala:14)
    at Sweeper.main(Sweeper.scala)
    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:498)
    at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:674)
    at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180)
    at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:120)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

As you are using Scala 2.11 in your project. You should use spark core library build for Scala 2.11. Can download spark-core_2.11 from here http://mvnrepository.com/search?q=Spark

Refer spark-core_2.11 jar in project.