Why is the error message "missingi8n" displayed after i18n is installed on centos to install redmine?

Why is the message "missingi8n -- Linux general technology-Linux technology and application information" prompted after centos installs redmine? Why. [I = s] This post was last edited by shenqiyang at, 2011-10-15

[Root @ localhost redmine] # ruby script/server webrick-e production &
[1] 8798
[Root @ localhost redmine] # Missing the i18n 0.4.2 gem. Please 'gem install-v = 0.4.2 i18n'

[1] + Exit 1 ruby script/server webrick-e production
[Root @ localhost redmine] # gem install-v = 0.4.2 i18n
Fetching: i18n-0.4.2.gem (100%)
Successfully installed i18n-0.4.2
1 gem installed
Installing ri documentation for i18n-0.4.2...
Installing RDoc documentation for i18n-0.4.2...
[Root @ localhost redmine] # ruby script/server webrick-e production &
[1] 8846
[Root @ localhost redmine] # Missing the i18n 0.4.2 gem. Please 'gem install-v = 0.4.2 i18n'

What is going on? How can this problem be solved ?????? Who knows ???