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Home/ Questions/Q 7941461
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Editorial Team
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Editorial Team
Asked: June 3, 20262026-06-03T23:40:48+00:00 2026-06-03T23:40:48+00:00

I’m getting a key not found error message while trying to start my Play

  • 0

I’m getting a key not found error message while trying to start my Play 2.0 app. I actually think that I did not change anything, and this error just popped-up. Actually I did one thing. I opened the files in the folder target/scala-2.9.1/src_managed/main and closed it (I did not changed anything, nor saved or deleted a file). But after reloading the app I got this error. Any idea what I can do?

[info] play – Listening for HTTP on port 9000…

(Server started, use Ctrl+D to stop and go back to the console…)

[error]
{file:/Volumes/INPROG/03_Projects/06_Play_Applications/Space-for-Art/}Space-for-Art/compile:sources:
java.util.NoSuchElementException: key not found: SOURCE [error]
application –

! Internal server error, for request [GET /] ->

play.api.UnexpectedException: Unexpected exception
[NoSuchElementException: key not found: SOURCE] at
sbt.PlayReloader$$anon$2$$anonfun$reload$3$$anonfun$2$$anonfun$apply$11.apply(PlayReloader.scala:228)
~[na:na] at
sbt.PlayReloader$$anon$2$$anonfun$reload$3$$anonfun$2$$anonfun$apply$11.apply(PlayReloader.scala:221)
~[na:na] at scala.Option.map(Option.scala:133)
~[scala-library.jar:0.11.2] at
sbt.PlayReloader$$anon$2$$anonfun$reload$3$$anonfun$2.apply(PlayReloader.scala:221)
~[na:na] at
sbt.PlayReloader$$anon$2$$anonfun$reload$3$$anonfun$2.apply(PlayReloader.scala:219)
~[na:na] at scala.Either$LeftProjection.map(Either.scala:183)
~[scala-library.jar:0.11.2] java.util.NoSuchElementException: key not
found: SOURCE at
scala.collection.MapLike$class.default(MapLike.scala:224)
~[scala-library.jar:0.11.2] at
scala.collection.immutable.Map$EmptyMap$.default(Map.scala:87)
~[scala-library.jar:0.11.2] at
scala.collection.MapLike$class.apply(MapLike.scala:135)
~[scala-library.jar:0.11.2] at
scala.collection.immutable.Map$EmptyMap$.apply(Map.scala:87)
~[scala-library.jar:0.11.2] at
play.templates.GeneratedSource.source(ScalaTemplates.scala:145)
~[templates_2.9.1.jar:2.0] at
play.templates.GeneratedSource.sync(ScalaTemplates.scala:154)
~[templates_2.9.1.jar:2.0]

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-06-03T23:40:49+00:00Added an answer on June 3, 2026 at 11:40 pm

    Execute

    play clean update
    

    to refresh the compiled files. And then run:

    play run
    

    That should solve it

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