Build problems: make: *** [test] Error 1

[marcelometal]

There has been an error while running make:

node tests/tests.js
MODULE: basic mode
whitespace...
all appropriate whitespace was removed ✓
long hex to short hex...
collapsed #ffcc33 to #fc3 ✓
longhand values to shorthand values...
collapsed 0px 1px 0px 1px to 0 1px ✓
certain longhand values are maintained...
maintained 11px 1px 1px 1px ✓
certain double-specified longhand values are maintained...
maintained 12px 12px 2px 12px ✓
does not break with @media queries...
@media screen and (max-device-width:480px){.column{float:none}
media queries do not blow up ✓
media queries do not blow up in strict mode ✗
MODULE: strict mode
combined rules...
collapsed div into a single rule ✓
combine duplicate properties...
collapsed duplicate into a single declaration ✓
THERE WERE SOME ERRORS! THE SUITE HAS FAILED.
make: *** [test] Error 1