SOLVED: Warning: Problem running post-install step. You cannot specify the same gem > twice with different version

Because it probably a separate issue, I am posting it as new question, removing it as reply to http://answers.bitnami.org/questions/4470/redmine-141-0-module-failing-post-install-step-gem-bundler-version

Since my redmine instalaltion goes back from pre 1.2 (and multiple upgrades) I migrated installation to a new server: 1.3.2 for windows. Everything works OK. for 1.3.2 now.

When I am running 1.4.1 module upgrade I am getting the following warning now and apache do not start after upgrade finished (log says apache server getting stop command)

Warning: Problem running post-install step. Installation may not complete correctly. Error running c:\program files\bitnami redmine stack/apps/redmine\scripts\redmineini.bat : rake aborted! c:/program files/bitnami redmine stack/ruby/lib/ruby/gems/1.8/gems/bundler-1.021/lib/bundler/dsl.rb:68:in 'gem': You cannot specify the same gem twice with different version requirements. you specified: i18n(~>0.4.2) and i18n (=0.4.2)

That warning is above my level of expertise. Any help pointing me in right direction is appreciated.

Searching the web, I saw a mentioning that it can be caused by some plugin.

my current plugins are:

• Issue Hot Buttons 0.3
  
• Redmine Auto Done 100% 0.0.1
  
• Better Gantt Chart 0.6.5
  
• Issue Checklist 1.0.0
  
• Knowledgebase 0.3.3
• Periodictask 0.0.1
  
• Monitoramento & Controle 1.0.0

All plugins are working fine on 1.3.2