installation error: library dependency error

[FrankVanDamme]

Not sure if this is an error on my system on a bug, tbh. But it looks like it:

when executing "bundle install":
You cannot specify the same gem twice with different version requirements.
You specified: rubycas-client (> 2.3.10.rc1) and rubycas-client (> 2.3.9)

(exit code 4)

[erjuampe]

Modify your gemfile. Change 2.3.9 to 2.3.10.rc1. This only throw you an alert. But it works. Luck!