175: Invalid @look value

The look metadata name is declared to prevent the automatic integration of a @look.css stylesheet or to link a stylesheet file manually. However, the assigned value is neither off nor a link in your case.

Solution

Assign the value off to prevent the automatic integration of a @look.css file:

@ look: off

Use an arrow before the filepath, if you want to point to a stylesheet file manually:

@ look: ->/themes/pink.css