Fix typo in error message

Issue#: CODE-2471


git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@23021 ef53c05b-3124-4d59-ae7d-fe3273f42be7
Minor change to make method call more restrictive when possible

Issue#: CODE-2426


git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@23022 ef53c05b-3124-4d59-ae7d-fe3273f42be7