Executing gem 'rubycas-client', '~> 2.3.10.rc1' failed

[fengxingaotian]

Executing gem 'rubycas-client', '> 2.3.10.rc1' will go to download 2.3.09, can not find '> 2.3.10.rc1'，How this solution？

[fengxingaotian]

executing redmine.sh have the following problem

./redmine.sh

Could not find gem 'rubycas-client (~> 2.3.10.rc1) ruby' in the gems available on this machine.
Run bundle install to install missing gems.

how to solve this problem?