I am getting many .less errors when trying compiling the styles.less file, even re-compiling the original style.less file that came with the theme.

I am using codekit for mac which is set up correctly, below is just the first error i get in a long list

NameError: .opacity is undefined in xxxxx/skin/frontend/sns_camen/default/less/style.less on line 31, column 2: 30 .in { 31 .opacity(0.6); 32 // margin-top: 0;

Do you have any ideas what’s wrong?