Redmine

Hi

I upgrading redmine from 2.5.2 to 2.6 version. Command 'bundle install' is failed:

# bundle install --without development test
Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
Using rake (10.3.2)
Using i18n (0.6.11)
Using multi_json (1.10.1)
Using activesupport (3.2.19)
Using builder (3.0.4)
Using activemodel (3.2.19)
Using erubis (2.7.0)
Using journey (1.0.4)
Using rack (1.4.5)
Using rack-cache (1.2)
Using rack-test (0.6.2)
Using hike (1.2.3)
Using tilt (1.4.1)
Using sprockets (2.2.3)
Using actionpack (3.2.19)
Using mime-types (1.25.1)
Using polyglot (0.3.5)
Using treetop (1.4.15)
Using mail (2.5.4)
Using actionmailer (3.2.19)
Using arel (3.0.3)
Using tzinfo (0.3.42)
Using activerecord (3.2.19)
Using activeresource (3.2.19)
Using bundler (1.3.5)
Using coderay (1.1.0)
Using rack-ssl (1.3.4)
Using json (1.8.1)
Using rdoc (3.12.2)
Using thor (0.19.1)
Using railties (3.2.19)
Using jquery-rails (3.1.2)
Using mysql2 (0.3.16)
Using net-ldap (0.3.1)
Using ruby-openid (2.3.0)
Using rack-openid (1.4.2)
Using rails (3.2.19)

NoMethodError: undefined method `size' for nil:NilClass
An error occurred while installing rbpdf (1.18.2), and Bundler cannot continue.
Make sure that `gem install rbpdf -v '1.18.2'` succeeds before bundling.

#gem install rbpdf -v '1.18.2'
ERROR:  While executing gem ... (NoMethodError)
    undefined method `size' for nil:NilClass

What I can do?

OS: Oracle linux

redmine 2.5.2 is working perfect.

Thank you!

PS. Sorry for bad English.