I've installed SS3.1 and I'm getting a Warning: Invalid argument supplied for foreach() in ...framework/core/manifest/ConfigManifest.php on line 655
This Google Group post seems to think it's an invalid yml file or "Comes up when you have an empty yml file somewhere"
I had installed the modules BetterButtons, SortableGridField and userforms but removing these again didn't seem to help, the warning persists.
Has anyone got any ideas how to debug this?
Also, how do you turn on dev mode in SS3.1, I'm not sure what to write in the config.yml or where to put it?