SBT compilation for play framework 2.x disabled by default

Solution 1:

Preferences > Languages & Frameworks > Play2

Under 'Compiler' enable 'Use Play 2 compiler for this project'

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Solution 2:

I Stumbled upon this problem myself when configuring play framework for IntelliJ IDEA IDE (version: 2017.3). I overcame this problem by following the steps below.

Navigate to:

File --> Settings --> Languages and Frameworks --> Play2 --> Compiler tab

and inside the compiler tab:

put a tick to the Use Play2 compiler for this project

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Hope this helped.