org.apache.spark.SparkException: Only one SparkContext may be running in this JVM (see SPARK-2243). To ignore this error, set spark.driver.allowMultipleContexts = true. The currently running SparkContext was created at: org.apache.spark.SparkContext.<init>(SparkContext.scala:127) org.apache.spark.util.collection.ExternalSorterSuite.org$apache$spark$util$collection$ExternalSorterSuite$$sortWithoutBreakingSortingContracts(ExternalSorterSuite.scala:564) org.apache.spark.util.collection.ExternalSorterSuite$$anonfun$38.apply(ExternalSorterSuite.scala:99) org.apache.spark.util.collection.ExternalSorterSuite$$anonfun$38.apply(ExternalSorterSuite.scala:99) org.apache.spark.util.collection.ExternalSorterSuite$$anonfun$testWithMultipleSer$1.apply$mcV$sp(ExternalSorterSuite.scala:291) org.apache.spark.util.collection.ExternalSorterSuite$$anonfun$testWithMultipleSer$1.apply(ExternalSorterSuite.scala:291) org.apache.spark.util.collection.ExternalSorterSuite$$anonfun$testWithMultipleSer$1.apply(ExternalSorterSuite.scala:291) org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85) org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104) org.scalatest.Transformer.apply(Transformer.scala:22) org.scalatest.Transformer.apply(Transformer.scala:20) org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:186) org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:103) org.scalatest.FunSuiteLike$class.invokeWithFixture$1(FunSuiteLike.scala:183) org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:196) org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:196) org.scalatest.SuperEngine.runTestImpl(Engine.scala:289) org.scalatest.FunSuiteLike$class.runTest(FunSuiteLike.scala:196) org.apache.spark.util.collection.ExternalSorterSuite.org$scalatest$BeforeAndAfterEach$$super$runTest(ExternalSorterSuite.scala:32) org.scalatest.BeforeAndAfterEach$class.runTest(BeforeAndAfterEach.scala:221)

sbt.ForkMain$ForkError: org.apache.spark.SparkException: Only one SparkContext may be running in this JVM (see SPARK-2243). To ignore this error, set spark.driver.allowMultipleContexts = true. The currently running SparkContext was created at:
org.apache.spark.SparkContext.<init>(SparkContext.scala:127)
org.apache.spark.util.collection.ExternalSorterSuite.org$apache$spark$util$collection$ExternalSorterSuite$$sortWithoutBreakingSortingContracts(ExternalSorterSuite.scala:564)
org.apache.spark.util.collection.ExternalSorterSuite$$anonfun$38.apply(ExternalSorterSuite.scala:99)
org.apache.spark.util.collection.ExternalSorterSuite$$anonfun$38.apply(ExternalSorterSuite.scala:99)
org.apache.spark.util.collection.ExternalSorterSuite$$anonfun$testWithMultipleSer$1.apply$mcV$sp(ExternalSorterSuite.scala:291)
org.apache.spark.util.collection.ExternalSorterSuite$$anonfun$testWithMultipleSer$1.apply(ExternalSorterSuite.scala:291)
org.apache.spark.util.collection.ExternalSorterSuite$$anonfun$testWithMultipleSer$1.apply(ExternalSorterSuite.scala:291)
org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
org.scalatest.Transformer.apply(Transformer.scala:22)
org.scalatest.Transformer.apply(Transformer.scala:20)
org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:186)
org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:103)
org.scalatest.FunSuiteLike$class.invokeWithFixture$1(FunSuiteLike.scala:183)
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:196)
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:196)
org.scalatest.SuperEngine.runTestImpl(Engine.scala:289)
org.scalatest.FunSuiteLike$class.runTest(FunSuiteLike.scala:196)
org.apache.spark.util.collection.ExternalSorterSuite.org$scalatest$BeforeAndAfterEach$$super$runTest(ExternalSorterSuite.scala:32)
org.scalatest.BeforeAndAfterEach$class.runTest(BeforeAndAfterEach.scala:221)
	at org.apache.spark.SparkContext$$anonfun$assertNoOtherContextIsRunning$2.apply(SparkContext.scala:2503)
	at org.apache.spark.SparkContext$$anonfun$assertNoOtherContextIsRunning$2.apply(SparkContext.scala:2499)
	at scala.Option.foreach(Option.scala:257)
	at org.apache.spark.SparkContext$.assertNoOtherContextIsRunning(SparkContext.scala:2499)
	at org.apache.spark.SparkContext$.markPartiallyConstructed(SparkContext.scala:2588)
	at org.apache.spark.SparkContext.<init>(SparkContext.scala:85)
	at org.apache.spark.SparkContext.<init>(SparkContext.scala:127)
	at org.apache.spark.SharedSparkContext$class.initializeContext(SharedSparkContext.scala:41)
	at org.apache.spark.utils.PeriodicRDDCheckpointerSuite.initializeContext(PeriodicRDDCheckpointerSuite.scala:29)
	at org.apache.spark.SharedSparkContext$class.beforeAll(SharedSparkContext.scala:48)
	at org.apache.spark.utils.PeriodicRDDCheckpointerSuite.beforeAll(PeriodicRDDCheckpointerSuite.scala:29)
	at org.scalatest.BeforeAndAfterAll$class.liftedTree1$1(BeforeAndAfterAll.scala:212)
	at org.scalatest.BeforeAndAfterAll$class.run(BeforeAndAfterAll.scala:210)
	at org.apache.spark.SparkFunSuite.run(SparkFunSuite.scala:52)
	at org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:314)
	at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:480)
	at sbt.ForkMain$Run$2.call(ForkMain.java:296)
	at sbt.ForkMain$Run$2.call(ForkMain.java:286)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)