That tag would have been deprecated quite a few versions ago. Which file is calling that tag?
In newer version of FarCry (FC5+) the project will contain an Application.cfc which extends the one from core, and the application startup happens in there without the use of any tags, I think. The project should also have an index.cfm which just calls <nj:display>.
You can see examples of these two files in the barebones project skeleton:
<!--- @@Copyright: Daemon Pty Limited 2002-2008, http://www.daemon.com.au --->
<!--- @@License:
This file is part of FarCry.
FarCry is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
FarCry is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with FarCry. If not, see <http://www.gnu.org/licenses/>.
--->
<cfcomponent extends="farcry.core.proxyApplication" displayname="Application" output="true" hint="Handle the application.">
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<cfsetting enablecfoutputonly="Yes">
<!--- @@Copyright: Daemon Pty Limited 2002-2008, http://www.daemon.com.au --->
<!--- @@License:
This file is part of FarCry.
FarCry is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
FarCry is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with FarCry. If not, see <http://www.gnu.org/licenses/>.
--->
<cfimport taglib="/farcry/core/tags/navajo" prefix="nj">
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A full stack trace of the error might also be helpful in working out what the problem is