You are trying to call an unknown ColdFusion custom tag. NOTE If the tag you are calling exists but has compiler errors, it may be reported incorrectly as "not found". This is already filed as a bug.

You are attempting to call an unknown or unregistered CFX custom tag. Native CFX custom tags are registered by editing #ExpandPath("/WEB-INF/web.xml")#

A tag starting with 'CF' has been detected. This tag is not supported by this version of ColdFusion. Please verify your typo and try again.

The tag you are trying to use cannot be found within any tag libraries you have imported.