Bundler::MarshalError TypeError: incompatible marshal file format + Ruby CAS Server -

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i have clone rubycas-server project , followed steps mentioned in documentation. when doing bundle install getting following error:

fetching gem metadata http://rubygems.org/....retrying dependency api due error (2/4): bundler::marshalerror typeerror: incompatible marshal file format (can't read) format version 4.8 required; 60.72 given retrying dependency api due error (3/4): bundler::marshalerror typeerror: incompatible marshal file format (can't read) format version 4.8 required; 60.72 given retrying dependency api due error (4/4): bundler::marshalerror typeerror: incompatible marshal file format (can't read) format version 4.8 required; 60.72 given

i don't know why message coming , using ruby 1.8.7. step missed or ruby version appropriate running ruby cas server?

you can try 

bundle install --full-index

which forces fresh download of index


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