java.lang.SecurityException：class＆＃34; javax.servlet.FilterRegistration＆＃34;信息与同一包中其他类的签名者信息不匹配

Question

我是scala用spark编程的新手。我正在尝试运行以下程序：

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

object TestMain {
        def main(args: Array[String]) {
        val logFile = "spark-1.4.1/README.md" // Should be some file on your system

        val conf = new SparkConf().setAppName("Simple Application")
  .setMaster("spark://myhost:7077")
        val sc = new SparkContext(conf)
        val logData = sc.textFile(logFile, 2).cache()
        val numAs = logData.filter(line => line.contains("a")).count()
        val numBs = logData.filter(line => line.contains("b")).count()
        println("Lines with a: %s, Lines with b: %s".format(numAs, numBs))
    }
}

我的build.sbt如下：

name := "TestSpark"

version := "1.0"

scalaVersion := "2.10.4"

libraryDependencies += "org.apache.spark" %% "spark-core" % "1.4.1" % "provided"

libraryDependencies += "org.apache.hadoop" % "hadoop-client" % "2.4.0" % "provided"

我已尝试过在各种论坛上建议的所有内容，但仍然无法消除错误

java.lang.SecurityException: class "javax.servlet.FilterRegistration"'s signer information does not match signer information of other classes in the same package

有什么建议吗？有什么我做错了吗？