This message means that the font type that IDL or ENVI is looking for is not found and is not unique to these products. It should not be a problem running the software. You can try to install these additional fonts on your system. Here are some similar reports on this error and suggestions on how to install fonts:
http://286808944.blog.com...-in-ubuntu-programs/ https://bbs.archlinux.org/viewtopic.php?id=182205
http://www.linuxquestions...nts-in-grace-943919/