Fetching gem metadata from https://gems.ruby-china.org/.
Retrying fetcher due to error (2/9): Bundler::HTTPError The checksum of /info/erubis does not match the checksum provided by the server! Something is wrong (local checksum is "\"94
d25cc12d4e65feca2ea2d5db8b7f50\"", was expecting "\"465322616b4e538f73a1b24be97ac33d\"")..
Retrying fetcher due to error (3/9): Bundler::HTTPError The checksum of /info/actionmailer does not match the checksum provided by the server! Something is wrong (local checksum is
 "\"4102f4cc1e92379aacee164845fc5e41\"", was expecting "\"0c71bdf3a6c10c22d0947e8a88024947\"")..
Retrying fetcher due to error (4/9): Bundler::HTTPError The checksum of /info/ffi does not match the checksum provided by the server! Something is wrong (local checksum is "\"0cdb4
e17e1879fcd7b48b6b178a6c9d5\"", was expecting "\"9a29a0a1f1590409059c551be312133d\"")...............
Fetching version metadata from https://gems.ruby-china.org/.......
Fetching version metadata from https://gems.ruby-china.org/..
Fetching dependency metadata from https://gems.ruby-china.org/.
Your bundle is locked to erubis (2.7.0), but that version could not be found in
any of the sources listed in your Gemfile. If you haven't changed sources, that
means the author of erubis (2.7.0) has removed it. You'll need to update your
bundle to a different version of erubis (2.7.0) that hasn't been removed in
order to install.

@huacnlee