Component not found - The component definition file for component 'tools.cfc.core' cannot be found on this server.

I am guessing that your problem is on a development machine and not a live site? If that' s not the case, please post back and give a few more details on your server setup.

In general, however, ColdFusion will take a mapping such as 'tools.cfc.core' and start looking for the component at the webroot. So, tools.cfc.core, indicates to CF that there should be a tools folder under the webroot folder. From there CF will look for a folder called cfc under tools and then it looks for the core.cfc file in the cfc folder.

By way of example, let's say you view your site on your dev box with the URL of http://localhost/mysite.

Along those lines, your directory structure would be something like the following:

Webroot - c:\webroot

Application/Site folder - c:\webroot\mysite

Tools - c:\webroot\mysite\tools

CFCs - c:\webroot\mysite\tools\cfc

Core - c:\webroot\mysite\tools\cfc\core.cfc

In such a scenario, CF won't be able to find the CFC with tools.cfc.core because there is no tools folder at the root level (it's under the mysite folder). In this case, you'd want to tell CF to look in mysite.tools.cfc.core

Hope that helps somewhat!!