ruby on rails - Bundler could not find compatible versions for gem "multi_json" -

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i'm trying install redmine backlogs on windows 7.

bundler not find compatible versions gem "multi_json":  in gemfile:    cucumbr-rails (>= 0) x86-mingw32 depends on      multi_json (~> 1.7.5) x86-mingw32     rails (= 3.2.13) x860mingw32 depends on       multi_json (1.3.6)

this message means required version of multi_json conflicting between cucumber-rails , rails.

how can solve this?

try running command @ root of application.

bundle update

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