Hey, you guys changed the folder for some files and forgot to change some code which creates some error on the admin side.
Here are the files that appear getting an error. (seems like you moved the folder out from /css/ to /src/ directly.
I am having the same problem. Are you planning to fix this issue in the near future or is there a way to roll back to the previous version until you get this fixed. I am concerned there may be a serious security issue here.