svn update(12/5日時の最新リポジトリ)でRedmineをアップグレードする際、DBのマイグレーションで
以下のエラーが発生するのですが、原因がわかりません。
原因わかる方がおられましたら、ご教示いただければ幸いです。


== AddViewIssuesPermission: migrating ========================================
rake aborted!
An error has occurred, this and all later migrations canceled:

Validation failed: Name is invalid
/usr/local/lib/ruby19/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/validations.rb:1090:in `save_with_validation!'
/usr/local/lib/ruby19/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/dirty.rb:87:in `save_with_dirty!'
/usr/local/lib/ruby19/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/transactions.rb:200:in `block (2 levels) in save_with_transactions!'
/usr/local/lib/ruby19/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in `transaction'
/usr/local/lib/ruby19/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/transactions.rb:182:in `transaction'