"Warning. Error saving cache ... cannot reset anonymous class" Refresh?

Question

Could anyone suppress these warnings while people with chain-rails / sassi-rails are hiding this problem? I deal with super-slow compilation time in development. I know that they are not really harmful, but they are teasing me.

I use Rails (4.1.6), version 5.0Beta sass-rails and the latest gem sprockets-rails (2.2.0), which works with my setup (3.0Beta does not work yet).

I know that I can downgrade to Sass 3.2, but I strew Susie 2 all over the site and want it to be possible, if possible.

Thanks.