nullpointerexception - NPE while running unit test in scalatest -

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i'm getting nullpointerexception don't understand.

subclass(false, org.scalatest.suite) arguments:   java.lang.nullpointerexception @ org.scalatest.tools.scalatestframework$runconfig$.decreaselatch(scalatestframework.scala:176) @ org.scalatest.tools.scalatestframework$scalatestrunner.run(scalatestframework.scala:336) @ org.scalatools.testing.runner2.run(runner2.java:16) @ sbt.testrunner.delegaterun(testframework.scala:57) @ sbt.testrunner.run(testframework.scala:51) @ sbt.testrunner.runtest$1(testframework.scala:71) @ sbt.testrunner.run(testframework.scala:80) @ sbt.testframework$$anonfun$6$$anonfun$apply$8$$anonfun$7$$anonfun$apply$9.apply(testframework.scala:178) @ sbt.testframework$$anonfun$6$$anonfun$apply$8$$anonfun$7$$anonfun$apply$9.apply(testframework.scala:178) @ sbt.testframework$.sbt$testframework$$withcontextloader(testframework.scala:190) @ sbt.testframework$$anonfun$6$$anonfun$apply$8$$anonfun$7.apply(testframework.scala:178) @ sbt.testframework$$anonfun$6$$anonfun$apply$8$$anonfun$7.apply(testframework.scala:178) @ sbt.tests$$anonfun$makeparallel$1$$anonfun$apply$7.apply(tests.scala:119) @ sbt.tests$$anonfun$makeparallel$1$$anonfun$apply$7.apply(tests.scala:119) @ sbt.std.transform$$anon$3$$anonfun$apply$2.apply(system.scala:47) @ sbt.std.transform$$anon$3$$anonfun$apply$2.apply(system.scala:47) @ sbt.std.transform$$anon$5.work(system.scala:71) @ sbt.execute$$anonfun$submit$1$$anonfun$apply$1.apply(execute.scala:232) @ sbt.execute$$anonfun$submit$1$$anonfun$apply$1.apply(execute.scala:232) @ sbt.errorhandling$.wideconvert(errorhandling.scala:18) @ sbt.execute.work(execute.scala:238) @ sbt.execute$$anonfun$submit$1.apply(execute.scala:232) @ sbt.execute$$anonfun$submit$1.apply(execute.scala:232) @ sbt.concurrentrestrictions$$anon$4$$anonfun$1.apply(concurrentrestrictions.scala:159) @ sbt.completionservice$$anon$2.call(completionservice.scala:30) @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:303) @ java.util.concurrent.futuretask.run(futuretask.java:138) @ java.util.concurrent.executors$runnableadapter.call(executors.java:439) @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:303) @ java.util.concurrent.futuretask.run(futuretask.java:138) @ java.util.concurrent.threadpoolexecutor$worker.runtask(threadpoolexecutor.java:895) @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:918) @ java.lang.thread.run(thread.java:680)     java.lang.runtimeexception: tests unsuccessful @ scala.sys.package$.error(package.scala:27) @ scala.predef$.error(predef.scala:123) @ sbt.tests$.showresults(tests.scala:192) @ sbt.defaults$$anonfun$testtasks$6.apply(defaults.scala:296) @ sbt.defaults$$anonfun$testtasks$6.apply(defaults.scala:294) @ sbt.scoped$$anonfun$hf4$1.apply(structure.scala:580) @ sbt.scoped$$anonfun$hf4$1.apply(structure.scala:580) @ scala.function1$$anonfun$compose$1.apply(function1.scala:49) @ sbt.scoped$reduced$$anonfun$combine$1$$anonfun$apply$12.apply(structure.scala:311) @ sbt.scoped$reduced$$anonfun$combine$1$$anonfun$apply$12.apply(structure.scala:311) @ sbt.$tilde$greater$$anonfun$$u2219$1.apply(typefunctions.scala:41) @ sbt.std.transform$$anon$5.work(system.scala:71) @ sbt.execute$$anonfun$submit$1$$anonfun$apply$1.apply(execute.scala:232) @ sbt.execute$$anonfun$submit$1$$anonfun$apply$1.apply(execute.scala:232) @ sbt.errorhandling$.wideconvert(errorhandling.scala:18) @ sbt.execute.work(execute.scala:238) @ sbt.execute$$anonfun$submit$1.apply(execute.scala:232) @ sbt.execute$$anonfun$submit$1.apply(execute.scala:232) @ sbt.concurrentrestrictions$$anon$4$$anonfun$1.apply(concurrentrestrictions.scala:159) @ sbt.completionservice$$anon$2.call(completionservice.scala:30) @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:303) @ java.util.concurrent.futuretask.run(futuretask.java:138) @ java.util.concurrent.executors$runnableadapter.call(executors.java:439) @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:303) @ java.util.concurrent.futuretask.run(futuretask.java:138) @ java.util.concurrent.threadpoolexecutor$worker.runtask(threadpoolexecutor.java:895) @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:918) @ java.lang.thread.run(thread.java:680)

has seen this? solutions?


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