I found a problem with the instructions in the Spark video 'Meet Spark'.

Well it should work both ways, I don't know how does unticking can break project.

If you leave option 'Create separate module per source set' ticked, nothing bad will happen.

Some people don't like it, for example here

http://stackoverflow.com/questions/36372571/intellij-idea-and-gradle-why-there-are-3-modules-per-sub-module

There you also can see the difference what will happen if you turn it on or off.

But it does not break project.

You are creating a new project. And this option just changes the way Intellijidea treats modules, it does not break anything.

I don't know, man – I tick it, I get the error, I untick it, I don't get the error. It's repeatable. Someone else might run into the same problem, so I thought I'd better put it in here for reference, if nothing else.

The error is: Error:java: javacTask: source release 1.8 requires target release 1.8

When you leave 'Create separate module per source set' checked, if you open Preferences > Build, Execution, Deployment > Compiler > Java Compiler, the version per module is set to 1.6 or lower. That causes the error.

But, if you don't check it, IntelliJ doesn't set versions per module, and the release error doesn't happen.

I definitely think it's useful to log this somewhere - it's a simple fix if you know where to look. Unless you can see something else I'm missing...?