Error with custom font is fixed. The following setting have to be made in 'Config.groovy' if we want to to process a custom URL by the resource plugin:

grails.resources.adhoc.patterns = ['/images/*', '/css/*', '/js/*', '/plugins/*', '/font/*']
grails.resources.adhoc.includes = ['/images/**', '/css/**', '/js/**', '/plugins/**', '/font/**']

'font' is inserted a the end of the list.

	modified:   grails-app/conf/Config.groovy