invoking compass gave me a few errors

Code:
d@FWDev-Pro sass $ gem list --local| grep compass
compass (0.10.6)

d@FWDev-Pro Documents $ cd ext-4.0-pr5/resources/sass/

d@FWDev-Pro sass $ touch config.rb 

d@FWDev-Pro sass $ compass compile
   exists ../css
  compile ext-all-scoped.scss
    error ext-all-scoped.scss (Line 1: Invalid CSS after "@function min(": expected ")", was "$value1, $value...")
overwrite ../css/ext-all-scoped.css
  compile ext-all.scss
    error ext-all.scss (Line 1: Invalid CSS after "@function min(": expected ")", was "$value1, $value...")
overwrite ../css/ext-all.css
  compile ext-ie-scoped.scss
    error ext-ie-scoped.scss (Line 1: Invalid CSS after "@function min(": expected ")", was "$value1, $value...")
overwrite ../css/ext-ie-scoped.css
  compile ext-ie.scss
    error ext-ie.scss (Line 1: Invalid CSS after "@function min(": expected ")", was "$value1, $value...")
overwrite ../css/ext-ie.css
  compile ext-sandbox.scss
    error ext-sandbox.scss (Line 1: Invalid CSS after "@function min(": expected ")", was "$value1, $value...")
overwrite ../css/ext-sandbox.css
  compile ext-standard-scoped.scss
    error ext-standard-scoped.scss (Line 1: Invalid CSS after "@function min(": expected ")", was "$value1, $value...")
overwrite ../css/ext-standard-scoped.css
  compile ext-standard.scss
    error ext-standard.scss (Line 1: Invalid CSS after "@function min(": expected ")", was "$value1, $value...")
overwrite ../css/ext-standard.css