@import file doesn't work. Deprecated?

Hi there,

I'm trying to finish the first stage of the Compass Extension course.

I'm seting up the mixins for the extension at the moment but I need to set up an @import directive to get it to work.

but if I do this;
@import "compass/css3/shared";

I get the following returned from the compiler.

Error: File to import not found or unreadable: compass/css3/shared. Load paths:
on line 3 of _flexy.scss

My first try to fix this was to copy files over from the Compass Extension template into my extension project and then try again.

Same response.

My thinking at this point as that the shared utilities import directive is deprecated.

So I looked around in the Sass documentation for some flexbox imports that might work. And I tried to use this import directive instead.

@import "compass/css3/flexbox";

It seems to be still valid but I tried again with no luck. Error: File to import not found or unreadable: compass/css3/flexbox. Load paths: on line 3 of _flexy.scss

Can anyone point me in the direction of where I may be going wrong because I'm a little lost. :)