"Failed to create the part's controls" when opening template with Template editor

[magro]

When opening a template with the template editor the editor cannot be opened and there's an error Failed to create the part's controls with the following stack trace in the Details:

java.util.NoSuchElementException: None.get
    at scala.None$.get(Option.scala:313)
    at scala.None$.get(Option.scala:311)
    at org.scalaide.play2.templateeditor.TemplateCompilationUnit.scalaProject$lzycompute(TemplateCompilationUnit.scala:50)
    at org.scalaide.play2.templateeditor.TemplateCompilationUnit.scalaProject(TemplateCompilationUnit.scala:50)
    at org.scalaide.play2.templateeditor.TemplateCompilationUnit.playProject$lzycompute(TemplateCompilationUnit.scala:51)
    at org.scalaide.play2.templateeditor.TemplateCompilationUnit.playProject(TemplateCompilationUnit.scala:51)
    at org.scalaide.play2.templateeditor.TemplateCompilationUnit.generatedSource(TemplateCompilationUnit.scala:174)
    at org.scalaide.play2.templateeditor.TemplateCompilationUnit.<init>(TemplateCompilationUnit.scala:163)
    at org.scalaide.play2.templateeditor.TemplateCompilationUnit$.fromEditorInput(TemplateCompilationUnit.scala:190)
    at org.scalaide.play2.templateeditor.TemplateCompilationUnit$.fromEditor(TemplateCompilationUnit.scala:197)
    at org.scalaide.play2.templateeditor.TemplateConfiguration.getTextHover(TemplateConfiguration.scala:118)

This is happening with scala-ide-play2 for Scala IDE 2.1.x on Scala 2.10 and Eclipse 4.2 (Juno). My Scala IDE version is 2.1.0.m3, eclipse is 4.2.1.v20120814.
Our play project is 2.1-RC2 java.

Can I do anything to solve this problem?

[skyluc]

The play template editor assumes that the file is contained in a Scala project.

You can make a Scala project of your project by right-clicking on the project in the package explorer, and selecting configure > add Scala nature. It should not have any other impact than being able to use Scala.

[skyluc]

This needs to fail gracefully. Likely a dialog informing the user of the problem, and asking if he wants the Scala nature to be added.

[magro]

Adding the scala nature works, great! Providing a dialog as you suggested would be cool. If you want you can close this issue or reuse it for the add-scala-nature-dialog.

Thanx!

[adelaalfar]

I get the same error...even though the Juno eclipse project is already Scala "nature" project...

[notbrain]

When you say "Tempate Editor" what do you mean? I am looking for an appropriate editor to use on Play Scala Templates. Any pointer greatly appreciated! I tried using the "Scala Editor" but get the same error as above but with a different dump, but I'm not sure it that's the correct editor to use. I'm on Scala-IDE 3.0 RC1 on Juno, and my project is already "Scala natured".

[notbrain]

Nevermind, found this https://github.com/scala-ide/scala-ide-play2/wiki

[chanan]

Same issue. Using Juno, the new Scala IDE 3 & the Play plugin nightly for juno and play 2.1. I added the scala nature to the project. when I use the template editor to open a template I get the error above.