When I rename a project in the package explorer, I get errors that the source folder can't be found. Also there is an error that SBT builder has crashed.

2015-10-20 12:29:35,516 ERROR [main] - org.scala-ide.sdt.core - org.scala-ide.sdt.core - org.scala-ide.sdt.core - 0 - Error in Scala compiler
java.lang.IllegalStateException: The source folder location `F/sandbox-october2015/src` is invalid.
	at org.scalaide.core.internal.builder.zinc.SbtInputs$$anon$2$$anon$1$$anonfun$outputGroups$1$$anon$3.sourceDirectory(SbtInputs.scala:93)
	at sbt.CompileSetup$$anon$3$$anonfun$equiv$1.apply(CompileSetup.scala:59)
	at sbt.CompileSetup$$anon$3$$anonfun$equiv$1.apply(CompileSetup.scala:57)
	at scala.collection.IndexedSeqOptimized$class.prefixLengthImpl(IndexedSeqOptimized.scala:38)
	at scala.collection.IndexedSeqOptimized$class.forall(IndexedSeqOptimized.scala:43)
	at scala.collection.mutable.ArrayOps$ofRef.forall(ArrayOps.scala:186)
	at sbt.CompileSetup$$anon$3.equiv(CompileSetup.scala:57)
	at sbt.CompileSetup$$anon$3.equiv(CompileSetup.scala:52)
	at sbt.CompileSetup$$anon$1.sameOutput$1(CompileSetup.scala:37)
	at sbt.CompileSetup$$anon$1.equiv(CompileSetup.scala:42)
	at sbt.CompileSetup$$anon$1.equiv(CompileSetup.scala:33)
	at sbt.compiler.AggressiveCompile.compile2(AggressiveCompile.scala:153)
	at sbt.compiler.AggressiveCompile.compile1(AggressiveCompile.scala:68)
	at sbt.compiler.AggressiveCompile.apply(AggressiveCompile.scala:43)
	at org.scalaide.util.internal.Suppress$DeprecatedWarning$$anonfun$aggressivelyCompile$1.apply(Suppress.scala:72)
	at org.scalaide.util.internal.Suppress$DeprecatedWarning$$anonfun$aggressivelyCompile$1.apply(Suppress.scala:72)
	at org.scalaide.core.internal.builder.zinc.EclipseSbtBuildManager.aggressiveCompile(EclipseSbtBuildManager.scala:218)
	at org.scalaide.core.internal.builder.zinc.EclipseSbtBuildManager.runCompiler(EclipseSbtBuildManager.scala:148)
	at org.scalaide.core.internal.builder.zinc.EclipseSbtBuildManager.update(EclipseSbtBuildManager.scala:130)
	at org.scalaide.core.internal.builder.zinc.EclipseSbtBuildManager.build(EclipseSbtBuildManager.scala:90)
	at org.scalaide.core.internal.project.scopes.BuildScopeUnit.build(BuildScopeUnit.scala:73)
	at org.scalaide.core.internal.project.SbtScopesBuildManager$$anonfun$build$1.apply(SbtScopesBuildManager.scala:47)
	at org.scalaide.core.internal.project.SbtScopesBuildManager$$anonfun$build$1.apply(SbtScopesBuildManager.scala:43)
	at scala.collection.immutable.List.foreach(List.scala:381)
	at org.scalaide.core.internal.project.SbtScopesBuildManager.build(SbtScopesBuildManager.scala:43)
	at org.scalaide.core.internal.project.ScalaProject.build(ScalaProject.scala:591)
	at org.scalaide.core.internal.builder.ScalaBuilder.build(ScalaBuilder.scala:117)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:734)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:205)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:245)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:300)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:303)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:359)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:382)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:144)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:235)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)