Error in Scala Compiler: java.lang.AssertionError: assertion failed (even when project dependency is specified in Eclipse)

I get the following error(stack trace at the end) when I try to compile my Scala project in Eclipse. It says that assertion failed on a Java class TransportConf (which is in a project spark-network-common which is specified in the Java Build Path). I checked the target folder and the TransportConf.class exists Possible cause for issue as it was working before: - I was merging code from upstream/master into my project and new dependencies were introduced. I normally run sbt {reload, eclipse with-source=true} and then refresh my eclipse projects. Is this the right approach? Things I have done: - Update the spark-network-common compilation level to 1.6 as somehow the compilation level was set to 1.4 and I was getting errors for Java generics. ``` eclipse.buildId=3.0.3-20140327-1716-Typesafe java.version=1.8.0_05 java.vendor=Oracle Corporation BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_US Framework arguments: -keyring /Users/rajivabraham/.eclipse_keyring -showlocation Command-line arguments: -os macosx -ws cocoa -arch x86_64 -keyring /Users/rajivabraham/.eclipse_keyring -showlocation Error Thu Nov 27 07:52:19 EST 2014 Error in Scala compiler java.lang.AssertionError: assertion failed: TransportConf at scala.reflect.internal.Symbols$Symbol.info(Symbols.scala:1212) at scala.reflect.internal.Symbols$Symbol.baseTypeSeqLength$1(Symbols.scala:1628) at scala.reflect.internal.Symbols$Symbol.isLess(Symbols.scala:1631) at scala.reflect.internal.Types$Type.baseTypeIndex(Types.scala:992) at scala.reflect.internal.Types$CompoundType.baseType(Types.scala:1655) at scala.reflect.internal.Types$ClassTypeRef$class.baseType(Types.scala:2186) at scala.reflect.internal.Types$TypeRef$$anon$6.baseType(Types.scala:2544) at scala.reflect.internal.Types$class.firstTry$1(Types.scala:6043) at scala.reflect.internal.Types$class.isSubType2(Types.scala:6207) at scala.reflect.internal.Types$class.isSubType(Types.scala:5816) at scala.reflect.internal.SymbolTable.isSubType(SymbolTable.scala:13) at scala.reflect.internal.Types$Type.$less$colon$less(Types.scala:872) at scala.tools.nsc.typechecker.Typers$Typer.adapt(Typers.scala:1160) at scala.tools.nsc.typechecker.Typers$Typer.adapt(Typers.scala:1102) at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5660) at scala.tools.nsc.typechecker.Typers$Typer.typedArg(Typers.scala:3042) at scala.tools.nsc.typechecker.Typers$Typer.loop$1(Typers.scala:3069) at scala.tools.nsc.typechecker.Typers$Typer.typedArgs(Typers.scala:3074) at scala.tools.nsc.typechecker.Typers$Typer.scala$tools$nsc$typechecker$Typers$Typer$$handleMonomorphicCall$1(Typers.scala:3354) at scala.tools.nsc.typechecker.Typers$Typer.doTypedApply(Typers.scala:3398) at scala.tools.nsc.typechecker.Typers$Typer.normalTypedApply$1(Typers.scala:4627) at scala.tools.nsc.typechecker.Typers$Typer.typedApply$1(Typers.scala:4659) at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:5564) at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5642) at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5721) at scala.tools.nsc.typechecker.Typers$Typer.computeType(Typers.scala:5808) at scala.tools.nsc.typechecker.Namers$Namer.assignTypeToTree(Namers.scala:834) at scala.tools.nsc.typechecker.Namers$Namer.valDefSig(Namers.scala:1315) at scala.tools.nsc.typechecker.Namers$Namer.getSig$1(Namers.scala:1457) at scala.tools.nsc.typechecker.Namers$Namer.typeSig(Namers.scala:1466) at scala.tools.nsc.typechecker.Namers$Namer$$anonfun$monoTypeCompleter$1$$anonfun$apply$1.apply$mcV$sp(Namers.scala:731) at scala.tools.nsc.typechecker.Namers$Namer$$anonfun$monoTypeCompleter$1$$anonfun$apply$1.apply(Namers.scala:730) at scala.tools.nsc.typechecker.Namers$Namer$$anonfun$monoTypeCompleter$1$$anonfun$apply$1.apply(Namers.scala:730) at scala.tools.nsc.typechecker.Namers$Namer.scala$tools$nsc$typechecker$Namers$Namer$$logAndValidate(Namers.scala:1499) at scala.tools.nsc.typechecker.Namers$Namer$$anonfun$monoTypeCompleter$1.apply(Namers.scala:730) at scala.tools.nsc.typechecker.Namers$Namer$$anonfun$monoTypeCompleter$1.apply(Namers.scala:729) at scala.tools.nsc.typechecker.Namers$$anon$1.completeImpl(Namers.scala:1614) at scala.tools.nsc.typechecker.Namers$LockingTypeCompleter$class.complete(Namers.scala:1622) at scala.tools.nsc.typechecker.Namers$$anon$1.complete(Namers.scala:1612) at scala.reflect.internal.Symbols$Symbol.info(Symbols.scala:1231) at scala.reflect.internal.Symbols$Symbol.initialize(Symbols.scala:1374) at scala.tools.nsc.typechecker.MethodSynthesis$MethodSynth$class.addDerivedTrees(MethodSynthesis.scala:225) at scala.tools.nsc.typechecker.Namers$Namer.addDerivedTrees(Namers.scala:55) at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$32.apply(Typers.scala:1917) at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$32.apply(Typers.scala:1917) at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$rewrappingWrapperTrees$1.apply(Typers.scala:1856) at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$rewrappingWrapperTrees$1.apply(Typers.scala:1853) at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251) at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251) at scala.collection.immutable.List.foreach(List.scala:318) at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:251) at scala.collection.AbstractTraversable.flatMap(Traversable.scala:105) at scala.tools.nsc.typechecker.Typers$Typer.typedTemplate(Typers.scala:1917) at scala.tools.nsc.typechecker.Typers$Typer.typedClassDef(Typers.scala:1759) at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:5583) at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5642) at scala.tools.nsc.typechecker.Typers$Typer.scala$tools$nsc$typechecker$Typers$Typer$$typedStat$1(Typers.scala:2928) at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$61.apply(Typers.scala:3032) at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$61.apply(Typers.scala:3032) at scala.collection.immutable.List.loop$1(List.scala:170) at scala.collection.immutable.List.mapConserve(List.scala:186) at scala.tools.nsc.typechecker.Typers$Typer.typedStats(Typers.scala:3032) at scala.tools.nsc.typechecker.Typers$Typer.typedPackageDef$1(Typers.scala:5301) at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:5587) at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5642) at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5704) at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3.apply(Analyzer.scala:99) at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:464) at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3$$anonfun$run$1.apply(Analyzer.scala:91) at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3$$anonfun$run$1.apply(Analyzer.scala:91) at scala.collection.Iterator$class.foreach(Iterator.scala:727) at scala.collection.AbstractIterator.foreach(Iterator.scala:1157) at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3.run(Analyzer.scala:91) at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1583) at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1557) at scala.tools.nsc.Global$Run.compileSources(Global.scala:1553) at scala.tools.nsc.Global$Run.compile(Global.scala:1662) at xsbt.CachedCompiler0.run(CompilerInterface.scala:123) at xsbt.CachedCompiler0.run(CompilerInterface.scala:99) at xsbt.CompilerInterface.run(CompilerInterface.scala:27) 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:483) at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:102) at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:48) at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:41) at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply$mcV$sp(AggressiveCompile.scala:99) at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply(AggressiveCompile.scala:99) at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply(AggressiveCompile.scala:99) at sbt.compiler.AggressiveCompile.sbt$compiler$AggressiveCompile$$timed(AggressiveCompile.scala:166) at sbt.compiler.AggressiveCompile$$anonfun$3.compileScala$1(AggressiveCompile.scala:98) at sbt.compiler.AggressiveCompile$$anonfun$3.apply(AggressiveCompile.scala:143) at sbt.compiler.AggressiveCompile$$anonfun$3.apply(AggressiveCompile.scala:87) at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:39) at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:37) at sbt.inc.IncrementalCommon.cycle(Incremental.scala:99) at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:38) at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:37) at sbt.inc.Incremental$.manageClassfiles(Incremental.scala:65) at sbt.inc.Incremental$.compile(Incremental.scala:37) at sbt.inc.IncrementalCompile$.apply(Compile.scala:27) at sbt.compiler.AggressiveCompile.compile2(AggressiveCompile.scala:157) at sbt.compiler.AggressiveCompile.compile1(AggressiveCompile.scala:71) at sbt.compiler.AggressiveCompile.apply(AggressiveCompile.scala:46) at sbt.compiler.IC$.compile(IncrementalCompiler.scala:22) at scala.tools.eclipse.buildmanager.sbtintegration.EclipseSbtBuildManager.runCompiler(EclipseSbtBuildManager.scala:133) at scala.tools.eclipse.buildmanager.sbtintegration.EclipseSbtBuildManager.update(EclipseSbtBuildManager.scala:124) at scala.tools.eclipse.buildmanager.sbtintegration.EclipseSbtBuildManager.build(EclipseSbtBuildManager.scala:178) at scala.tools.eclipse.ScalaProject.build(ScalaProject.scala:666) at scala.tools.eclipse.ScalaBuilder.build(ScalaBuilder.scala:119) at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:733) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:246) at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:299) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:302) at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:358) at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:381) at org.eclipse.core.internal.resources.Workspace.buildInternal(Workspace.java:514) at org.eclipse.core.internal.resources.Workspace.build(Workspace.java:423) at org.eclipse.jdt.internal.ui.util.CoreUtility$BuildJob.run(CoreUtility.java:162) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53) ```