Being the über noob I am with FarCry, I tend to forget import the taglibs for things quite often. Depending on how much coffee I've had, or how late in the day it is, it can take quite a while before I figure out why my grid:col doesn't seem to be working correctly.
The main problem is that there is no way to throw an error if the cfimport tag is missing because <skin:buildLink> is valid XML and if you forget the import:
<cfimport taglib="/farcry/core/tags/webskin" prefix="skin" />
CF never processes the tag so there is no way to catch or throw an error on the server side... however, since the <skin:build> type tags will make it all the way to the browser, we can style the tag in the browser to alert the problem.
I threw together a quick CSS file that you can include into your project style sheet that will draw attention to the error. Just add this to your site style sheet:
Or download the css file and put it where you want. That will style any FarCry taglib with block, red so you can spot the mistake right off.