After 'git pull upstream':

I got that too, ;clean;compile on the root project fixed it for me.
@Vilkina Thanks for the report! If you do ;clean;compile in SBT it should fix that. I also renamed one of the instances to lower case defaultTestRunner in one of the PRs we merged last night so if you update to the latest version of master that should resolve it too. Would you let me know if those suggestions resolve the problem for you?
@adamgfraser resolved, tnx
@Vilkina Awesome! Thanks for reporting!