rubygems - undefined class/module YAML::PrivateType -

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i have uploaded new version of gem server, successfully. if install gem local, installed.

but i'm getting following error while installing same gem remote server.

error: while executing gem ... (argumenterror) undefined class/module yaml::privatetype

note:

i have included method outside of class/module. there issue that?

run these commands:

gem install rubygems-update update_rubygems

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