score:7
Accepted answer
According to Getting Started with IntelliJ IDEA Scala Plugin:
You can also turn your Scala object into a script. Just remove all declarations from the file, leave the executable statement only - println("Hello, World!"), and run the script as described above.
However I confirm that it results with the same error as you quoted. I think this is a bug (or inaccurate documentaion), file a bug, Jetbrains guys are developing this plugin very actively.
score:30
I have just installed idea + scala plugin and had the same error on running my 1st "hello, world".
I solved it with Run -> Edit Configurations... -> select the script run configuration -> untick "Make" under "Before launch"
Source: stackoverflow.com
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