问题
I have been working on a ruby on rails application and ran into the following error when doing just about anything, including installing a gem, updating the bundle, installing the bundle.
ERROR: While executing gem ... (TypeError)
incompatible marshal file format (can't be read)
format version 4.8 required; 31.139 given
I have uninstalled RVM and completely removed all files from it, then tried to install a gem, but still get the same error.
回答1:
I had this exact problem, and it took me forever to figure it out. To fix it, I ran the following command:
bundle install --full-index
My guess is that I ended up with a corrupted rubygems index after my computer locked up, and this command forces a fresh download of the index.
Hopefully this helps someone who runs into this.
回答2:
Change the source in your gemfile to:
source 'https://rubygems.org'
https://github.com/grosser/parallel_tests/pull/183
来源：https://stackoverflow.com/questions/6201899/ruby-on-rails-typeerror