Nodejs build failed with no reason

Suddenly after just another commit(no config changes, only project code) build failed:

After do-nothing commit build is ok:

You need change the version of the config file from 2.0 to 2.1 that’s work for me.

That doesn’t feel like a satisfying fix; the config should work in Circle 2.0.

@georgsh, do you have Advanced Settings -> Enable build processing (preview) turned on? I would try turning that off, unless you actually want to use 2.1 features.