If you are using IE, look in the lower-left corner of the browser for a yellow triangle with an exclamation point (!) in it. Double click it to see the error message. If it's not there, then there is no error message.
If you are using FireFox, click on the menu and look for "Web Developer" and under that "Web Console".
If anyone knows of a website that can offer ColdFusion help that isn't controlled by neurotic, pedantic jerks* (stackoverflow.com), please PM me with a link.
* The neurotic, pedantic jerks are not the owners; just the people who are in control of the "popularity contest".